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A283331
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a(n) = (Sum_{j=1..(K-1)/2} a(n-2*j+1)*a(n-2*j))/a(n-K) with a(1),...,a(K)=1, where K=7.
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1
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1, 1, 1, 1, 1, 1, 1, 3, 5, 17, 89, 1529, 136169, 208203929, 9450306981389, 393518208756305576259, 218756933853729911666129962011049, 967245356889229414311807903425793640476269370763657, 138385630187929719100558260443148868172248984484844599503721372030874017578780705
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OFFSET
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1,8
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LINKS
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MATHEMATICA
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a[n_]:=If[n<8, 1, Sum[a[n - 2j + 1]*a[n-2j], {j, 3}]/a[n - 7]]; Table[a[n], {n, 1, 20}] (* Indranil Ghosh, Mar 17 2017 *)
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PROG
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(PARI) a(n)= if(n<8, 1, sum(j=1, 3, a(n - 2*j + 1)*a(n - 2*j))/a(n - 7));
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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