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Column 0 of triangle A107870; a(n) = C( n*(n-1)/2 + n+2, n).
2

%I #3 Mar 30 2012 18:36:46

%S 1,3,10,56,495,6188,100947,2035800,48903492,1362649145,43183019880,

%T 1533058025824,60246643120300,2595612872743443,121623751733457400,

%U 6156937298378625264,334817778672726215400,19463553270556728904725

%N Column 0 of triangle A107870; a(n) = C( n*(n-1)/2 + n+2, n).

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

%Y Cf. A107870, A107872.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Jun 04 2005