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 A004168 a(n+1) = a(n)*(a(n)+1). 4
 3, 12, 156, 24492, 599882556, 359859081592975692, 129498558604939936868397356895854556, 16769876680757063368089314196389622249367851612542961252860614401811692 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA a(n) = A082732(n+3) - 1. - Max Alekseyev, Aug 09 2019 MAPLE A004168 := proc(n) option remember; if n=0 then 3 else A004168(n-1)*(A004168(n-1)+1); fi; end; MATHEMATICA a = {3}; Do[AppendTo[a, a[[n - 1]] (a[[n - 1]] + 1)], {n, 2, 8}]; a (* Michael De Vlieger, Feb 23 2016 *) PROG (MAGMA) [n eq 1 select 3 else  Self(n-1)*(Self(n-1)+1): n in [1..10]]; // Vincenzo Librandi, Feb 23 2016 CROSSREFS Cf. A000058, A007018. Sequence in context: A285603 A098152 A028301 * A301650 A061960 A120606 Adjacent sequences:  A004165 A004166 A004167 * A004169 A004170 A004171 KEYWORD nonn,easy AUTHOR EXTENSIONS a(7) from Vincenzo Librandi, Feb 23 2016 STATUS approved

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Last modified December 11 07:47 EST 2019. Contains 329914 sequences. (Running on oeis4.)