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A123618
a(n) =
A123610
(2*n+2,n).
+0
6
1, 4, 39, 392, 4420, 52272, 644231, 8179600, 106376580, 1410528080, 19006875580, 259613952864, 3587352778256, 50068405195200, 704925148185495, 10001318622631200, 142866058397606500, 2053248549639210000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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