A030038 a(n+1) = Sum_{k=0..floor(3*n/5)} a(k) * a(n-k).

1, 1, 1, 2, 3, 6, 13, 26, 57, 117, 262, 602, 1329, 3079, 6903, 16161, 38185, 87745, 207896, 481817, 1148246, 2755781, 6485489, 15592656, 36899080, 88966356, 215687474, 515590781, 1251629165, 2998835401, 7291353036, 17803231663, 42980538045, 104981503048, 253813177447

Offset

0,4

Links

Seiichi Manyama, Table of n, a(n) for n = 0..1000

Prog

(PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=1, nn, v[n+2]=sum(k=1, 1+(3*n)\5, v[k]*v[n+2-k])); v; } \\ Jinyuan Wang, Mar 18 2020

Crossrefs

Cf. A000992, A030036, A030037, A030039.

Sequence in context: A052702 A058766 A127601 * A030040 A274493 A324770

Adjacent sequences: A030035 A030036 A030037 * A030039 A030040 A030041

Keyword

nonn

Author

N. J. A. Sloane

Extensions

More terms from Jinyuan Wang, Mar 18 2020

Status

approved