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 A368932 Expansion of (1/x) * Series_Reversion( x * (1-x) * (1-x-x^4) ). 3
 1, 2, 7, 30, 144, 741, 3996, 22287, 127495, 743941, 4410555, 26492349, 160875186, 986007700, 6091548256, 37894543413, 237168491610, 1492323419929, 9434943086870, 59906035386393, 381832957589226, 2442251022673595, 15670578495195870 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..22. FORMULA a(n) = (1/(n+1)) * Sum_{k=0..floor(n/4)} binomial(n+k,k) * binomial(3*n-3*k+1,n-4*k). PROG (PARI) a(n) = sum(k=0, n\4, binomial(n+k, k)*binomial(3*n-3*k+1, n-4*k))/(n+1); (PARI) my(N=30, x='x+O('x^N)); Vec(serreverse(x*(1-x)*(1-x-x^4))/x) CROSSREFS Cf. A236339, A368931, A368933. Cf. A063021, A215342. Sequence in context: A187979 A358964 A366055 * A369160 A243632 A196148 Adjacent sequences: A368929 A368930 A368931 * A368933 A368934 A368935 KEYWORD nonn AUTHOR Seiichi Manyama, Jan 10 2024 STATUS approved

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Last modified September 8 04:40 EDT 2024. Contains 375751 sequences. (Running on oeis4.)