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A107669 a(n) = A107668(n)/(n+1)^2. 3
1, 1, 5, 51, 809, 17575, 486460, 16384260, 650574249, 29762953831, 1541719486081, 89201504309927, 5702038255950404, 399105271607867940, 30359621863987241460, 2494052823831234355340, 220067051126228849480649 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

PROG

(PARI) {a(n)=local(A); if(n==0, n+1, A=(n+1)*x+x*O(x^n); for(k=0, n, A+=polcoeff(A, k)*x^k*(n+1-prod(i=0, k, 1+(i-n-1)*x))); polcoeff(A, n)/(n+1)^2)}

CROSSREFS

Cf. A107667, A107668, A107670.

Sequence in context: A299435 A095839 A234290 * A218675 A182316 A077392

Adjacent sequences:  A107666 A107667 A107668 * A107670 A107671 A107672

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jun 07 2005

STATUS

approved

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Last modified July 14 16:05 EDT 2020. Contains 335729 sequences. (Running on oeis4.)