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

Author

Paul D. Hanna, May 29 2005

Keywords

• nonn

Crossrefs

Cf. A108267.

Programs

PARI

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

Extensions

Offset corrected by Andrey Zabolotskiy, Nov 23 2021