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%I
%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 left-most 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
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