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%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
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