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A025225
a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 2. Also a(n) = (2^n)*C(n-1), where C =
A000108
(Catalan numbers).
+0
8
2, 4, 16, 80, 448, 2688, 16896, 109824, 732160, 4978688, 34398208, 240787456, 1704034304, 12171673600, 87636049920, 635361361920, 4634400522240, 33985603829760, 250420238745600, 1853109766717440
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Maintained by
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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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