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A030035
a(n+1) = Sum_{k=0..floor(3*n/4)} a(k) * a(n-k).
1
1, 1, 1, 2, 4, 9, 17, 38, 89, 213, 480, 1151, 2810, 6978, 16497, 40731, 101680, 256491, 623916, 1568966, 3972773, 10130647, 25044032, 63573638, 162478685, 417322917, 1049096179, 2687278965, 6917001254, 17882746627, 45391766669, 116995255065, 302689722551
OFFSET
0,4
LINKS
PROG
(PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=1, nn, v[n+2]=sum(k=1, 1+(3*n)\4, v[k]*v[n+2-k])); v; } \\ Jinyuan Wang, Mar 18 2020
CROSSREFS
KEYWORD
nonn
EXTENSIONS
More terms from Jinyuan Wang, Mar 18 2020
STATUS
approved