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A108268 Column 2 of triangle A108267. 0
1, 31, 381, 3431, 26769, 193705, 1343521, 9091270, 60632419, 401001030, 2639871326, 17339260251, 113792427233, 746807661549, 4903854042841, 32227106641988, 211992209767971, 1395903036647155, 9200826759772935 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

MAPLE

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

STATUS

approved

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Last modified June 13 10:28 EDT 2021. Contains 344985 sequences. (Running on oeis4.)