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A126452
Column 1 of triangle A126450; a(n) = C( C(n+3,3), n).
6
1, 4, 45, 1140, 52360, 3819816, 406481544, 59487568920, 11468588169060, 2818651865383860, 860587163078645431, 319667046321630491484, 141992594868360194121800, 74339194732961502662043600
OFFSET
0,2
MATHEMATICA
Table[Binomial[Binomial[n+3, 3], n], {n, 0, 20}] (* Harvey P. Dale, Oct 09 2014 *)
PROG
(PARI) a(n)=binomial((n+1)*(n+2)*(n+3)/3!, n)
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 27 2006
STATUS
approved