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A052609
(2*n-2)*n!.
+0
3
0, 0, 4, 24, 144, 960, 7200, 60480, 564480, 5806080, 65318400, 798336000, 10538035200, 149448499200, 2266635571200, 36614882304000, 627683696640000, 11381997699072000, 217680705994752000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
AT&T Labs Research
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