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 A072713 a(1)=a(2)=a(3)=a(4)=a(5)=1; for n>5, a(n)*a(n-5) = a(n-1)*a(n-2)*a(n-3)*a(n-4)+1. 2
 1, 1, 1, 1, 1, 2, 3, 7, 43, 1807, 815861, 147917502976, 1339566593057489572791, 6793440021984612817314824762112917427331, 607759339422199886496126580428414916308278553796099069562650354036190535151 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..19 MATHEMATICA nxt[{a_, b_, c_, d_, e_}]:={b, c, d, e, (b*c*d*e+1)/a}; Join[{1, 1, 1, 1}, Transpose[ NestList[nxt, {1, 1, 1, 1, 1}, 15]][[5]]] (* Harvey P. Dale, Oct 03 2012 *) CROSSREFS Cf. A005246, A051786. Sequence in context: A051786 A133400 A113845 * A000058 A129871 A075442 Adjacent sequences:  A072710 A072711 A072712 * A072714 A072715 A072716 KEYWORD nonn AUTHOR Benoit Cloitre, Aug 07 2002 STATUS approved

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Last modified January 18 13:05 EST 2019. Contains 319271 sequences. (Running on oeis4.)