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A124131
a(n)=((-1)^n/2)*sum_{i1+i2+i3=2n} ((2*n)!/(i1! i2! i3!))*B(i1+i2) where B are the Bernoulli numbers.
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0, 1, 1, 9, 77, 1037, 19113, 464785, 14410309, 554826453, 25971640865, 1452575521241, 95664836241981, 7327813077384349, 645942544224008857, 64924081840553650977, 7380723366892082000693, 942257770864409337556325
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Maintained by
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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