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 A030039 a(n+1) = Sum_{k=0..floor(4*n/5)} a(k) * a(n-k). 4
 1, 1, 1, 2, 4, 9, 21, 42, 97, 233, 570, 1414, 3319, 8208, 20595, 52370, 133955, 328261, 833652, 2136155, 5519116, 14341917, 36069212, 93074465, 241613666, 630653714, 1652472131, 4215072482, 10985970447, 28756470626, 75580683613, 199201407564, 513021407584 (list; graph; refs; listen; history; text; internal format)
 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+(4*n)\5, v[k]*v[n+2-k])); v; } \\ Jinyuan Wang, Mar 18 2020 CROSSREFS Cf. A000992, A030036, A030037, A030038. Sequence in context: A079060 A225173 A346737 * A018105 A035056 A332800 Adjacent sequences: A030036 A030037 A030038 * A030040 A030041 A030042 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 10 17:45 EDT 2024. Contains 375792 sequences. (Running on oeis4.)