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A107864 Column 2 of triangle A107862; a(n) = C( (n+1)*(n+2)/2 + n-1, n). 4
1, 3, 21, 220, 3060, 53130, 1107568, 26978328, 752538150, 23667689815, 828931106355, 32006008361808, 1350990969850340, 61902409203193230, 3060335715568296000, 162392216278033616560, 9206887338937200407418 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

PROG

(PARI) a(n)=binomial((n+1)*(n+2)/2+n-1, n)

CROSSREFS

Cf. A107862, A014068, A107864.

Sequence in context: A032033 A218494 A099121 * A267657 A303057 A113663

Adjacent sequences:  A107861 A107862 A107863 * A107865 A107866 A107867

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jun 04 2005

STATUS

approved

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Last modified November 12 12:43 EST 2018. Contains 317109 sequences. (Running on oeis4.)