Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #7 May 11 2014 05:07:28
%S 1,2,5,10,22,46,97,200,412,844,1729,3536,7227,14754,30093,61312,
%T 124782,253664,515085,1044796,2117158,4286330,8671103,17529304,
%U 35416016,71518510,144362774,291299094,587617054,1185060666,2389424213
%N Self-convolution of A092684.
%C A092684 is the leftmost column of triangle A092683.
%F a(n) = 1 + Sum_{k=1..n} Sum_{j=0..n-k} binomial(k, j)*a(j).
%o (PARI) {a(n)=1+sum(k=1,n,sum(j=0,n-k,binomial(k,j)*a(j)))}
%Y Cf. A092684, A092683.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Nov 23 2004