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A030036 a(n+1) = Sum_{k=0..floor(n/5)} a(k) * a(n-k). 0
1, 1, 1, 1, 1, 1, 2, 3, 5, 8, 13, 26, 47, 86, 159, 292, 584, 1121, 2156, 4153, 8014, 16028, 31472, 61823, 121490, 238827, 477654, 947294, 1878560, 3725648, 7389473, 14900436, 29796719, 59593438, 119178862, 238341696, 482287600, 970054641, 1951222247, 3924973230 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,7

LINKS

Table of n, a(n) for n=0..39.

PROG

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

CROSSREFS

Cf. A000992.

Sequence in context: A024318 A324738 A132915 * A115212 A158083 A042163

Adjacent sequences:  A030033 A030034 A030035 * A030037 A030038 A030039

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Jinyuan Wang, Mar 18 2020

STATUS

approved

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Last modified September 17 16:50 EDT 2021. Contains 347487 sequences. (Running on oeis4.)