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 A283918 a(n) = (1 + Sum_{j=1..K-2} a(n-j)*a(n-j-1))/a(n-K) with a(1),...,a(K)=1, where K=6. 2
 1, 1, 1, 1, 1, 1, 5, 9, 53, 529, 28565, 15139445, 86494677165, 145497982245073197, 237449075542565847670095797, 65308811677507188262439443927593494833685, 542885242695872953856134304668084060854561472461643166998594129 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..23 MATHEMATICA a[n_]:= If[n<7, 1, (1 + Sum[a[n - j] * a[n -j - 1], {j, 4}])/a[ n - 6]]; Table[a[n], {n, 23}] (* Indranil Ghosh, Mar 18 2017 *) PROG (PARI) a(n) = if(n<7, 1, (1 + sum(j=1, 4, a(n - j) * a(n - j - 1)))/a(n - 6)); for(n=1, 24, print1(a(n), ", ")) \\ Indranil Ghosh, Mar 18 2017 CROSSREFS Cf. A077458 (K=4), A283819 (K=5), this sequence (K=6), A283820 (K=7), A283920 (K=8), A283821 (K=9). Sequence in context: A123817 A124421 A262918 * A284382 A143554 A222536 Adjacent sequences:  A283915 A283916 A283917 * A283919 A283920 A283921 KEYWORD nonn AUTHOR Seiichi Manyama, Mar 17 2017 STATUS approved

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Last modified February 22 16:26 EST 2019. Contains 320399 sequences. (Running on oeis4.)