Search: id:A135868
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%I A135868
%S A135868 1,2,9,80,1368,45344,2952208,381005824,97928967168,50238812700672,
%T A135868 51495089926791168,105513593089512439808,432289346894817079853056,
%U A135868 3541746937174189008054386688,58031524865557213409213540204544
%N A135868 G.f. A(x) = (1 + x*A(2x))^2.
%C A135868 Self-convolution of A135867.
%o A135868 (PARI) {a(n)=local(A=1+x+x*O(x^n));for(i=0,n,A=1+x*subst(A,x,2*x)^2);
               polcoeff(A^2,n)}
%Y A135868 Cf. A135867.
%Y A135868 Sequence in context: A056918 A122720 A109519 this_sequence A147302 A112670 
               A117581
%Y A135868 Adjacent sequences: A135865 A135866 A135867 this_sequence A135869 A135870 
               A135871
%K A135868 nonn
%O A135868 0,2
%A A135868 Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2007

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