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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

Table of n, a(n) for n=0..7.

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

N. J. A. Sloane.

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.)