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Search: id:A081894
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| A081894 |
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A sequence related to C(n+2,2). |
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+0
3
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| 1, 7, 46, 290, 1775, 10625, 62500, 362500, 2078125, 11796875, 66406250, 371093750, 2060546875, 11376953125, 62500000000, 341796875000, 1861572265625, 10101318359375, 54626464843750, 294494628906250, 1583099365234375
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Binomial transform of A081893. 4th binomial transform of C(n+2,2), A000217. 5th binomial transform of (1,2,1,0,0,0,.....)
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FORMULA
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a(n)=5^n(n^2+19n+50)/50 G.f.(1-4x)^2/(1-5x)^3
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CROSSREFS
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Cf. A081907.
Sequence in context: A034471 A100024 A086092 this_sequence A128597 A067318 A072948
Adjacent sequences: A081891 A081892 A081893 this_sequence A081895 A081896 A081897
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 30 2003
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