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A030032 a(n+1) = Sum_{k=0..floor(n/3)} a(k) * a(n-k). 4
1, 1, 1, 1, 2, 3, 5, 10, 18, 33, 66, 127, 244, 506, 1009, 2018, 4229, 8631, 17631, 37265, 77349, 160433, 342807, 720334, 1513791, 3254445, 6902283, 14634519, 31602375, 67522598, 144182089, 312851626, 672411931, 1444776938, 3145883976, 6794243911, 14667444523 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
PROG
(PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=3, nn, v[n+2]=sum(k=1, 1+n\3, v[k]*v[n+2-k])); v; } \\ Jinyuan Wang, Mar 18 2020
CROSSREFS
Sequence in context: A199594 A081172 A318301 * A002661 A216959 A065053
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Jinyuan Wang, Mar 18 2020
STATUS
approved

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Last modified May 23 22:02 EDT 2024. Contains 372765 sequences. (Running on oeis4.)