A108268 Column 2 of triangle A108267.

1, 31, 381, 3431, 26769, 193705, 1343521, 9091270, 60632419, 401001030, 2639871326, 17339260251, 113792427233, 746807661549, 4903854042841, 32227106641988, 211992209767971, 1395903036647155, 9200826759772935

Offset

2,2

Links

Table of n, a(n) for n=2..20.

Prog

(PARI)
a(n)=polcoeff((1-x)^(n+1)*sum(j=0, n, binomial(n+n*j+j, n*j+j)*x^j), 2)

Crossrefs

Cf. A108267.

Sequence in context: A042868 A258944 A047689 * A214886 A091348 A328750

Adjacent sequences: A108265 A108266 A108267 * A108269 A108270 A108271

Keyword

nonn

Author

Paul D. Hanna, May 29 2005

Extensions

Offset corrected by Andrey Zabolotskiy, Nov 23 2021

Status

approved