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A161881
a(n) = Sum_{k=0..n-1} {[x^k] A(x)^(n-k)} * {[x^(n-k-1)} A(x)^(k+1)} for n>0, with a(0)=1, where g.f. A(x) = Sum_{n>=0} a(n)*x^n.
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1, 1, 2, 8, 46, 333, 2822, 26884, 280778, 3162129, 37962174, 481796692, 6424120440, 89561323131, 1300606338522, 19614272779492, 306422062160964, 4948682216714809, 82474329755007710, 1416291364674413764
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Maintained by
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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