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%I #2 Mar 31 2012 13:21:57
%S 0,1,1,2,4,13,101,5242,13747054,94490767454888,
%T 4464252567107002358694986701,
%U 9964775491460730298984873909049635615687553262572198767
%N a(1)=0, a(2)=1, a(n)=A000217(a(n-1)) + A000217(a(n-2)).
%o (PARI) t(n)=n*(n+1)/2 v=vector(12) v[2]=1 for (i=3,12,v[i]=t(v[i-1])+t(v[i-2])) v
%K nonn
%O 1,4
%A _Jon Perry_, Mar 13 2004
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