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A126447
Column 1 of triangle A126445; a(n) = C( C(n+3,3) - 1, n).
7
1, 3, 36, 969, 46376, 3478761, 377447148, 56017460733, 10912535409348, 2703343379981793, 830496702831140346, 310006778438284515093, 138247735223480364826280, 72613463426660610635960445
OFFSET
0,2
MATHEMATICA
Table[Binomial[Binomial[n+3, 3]-1, n], {n, 0, 20}] (* Harvey P. Dale, Apr 22 2022 *)
PROG
(PARI) a(n)=binomial((n+1)*(n+2)*(n+3)/3!-1, n)
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Dec 27 2006
STATUS
approved