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 A276130 a(0) = a(1) = a(2) = a(3) = a(4) = 1; for n>4, a(n) = ( a(n-1) +a(n-3) )*( a(n-2)+a(n-4) ) / a(n-5). 2
 1, 1, 1, 1, 1, 4, 10, 55, 649, 38881, 6414706, 24978826228, 2913605221297249, 112139525368095766797655, 8403341152380185679389503620974065, 146904111947501701959735285821948223340424963459227 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..22 FORMULA a(n) = (9-3*(-1)^n)/2*a(n-1)*a(n-3)-a(n-2)-a(n-4). PROG (PARI) a(n) = if (n<=4, 1, (9-3*(-1)^n)/2*a(n-1)*a(n-3)-a(n-2)-a(n-4)); \\ Michel Marcus, Aug 27 2016 CROSSREFS Cf. A006721. Sequence in context: A197902 A276123 A096423 * A263044 A013589 A225543 Adjacent sequences: A276127 A276128 A276129 * A276131 A276132 A276133 KEYWORD nonn AUTHOR Bruno Langlois, Aug 21 2016 STATUS approved

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Last modified September 24 19:02 EDT 2023. Contains 365581 sequences. (Running on oeis4.)