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A083069

Main diagonal of number array A083064.

1, 2, 11, 94, 1037, 14006, 224695, 4185098, 88888889, 2122152922, 56288512931, 1642813694534, 52332842192581, 1807181134905134, 67253754435399407, 2683521610790452306, 114296029267382825201, 5175920921241202064498, 248346947368421052631579, 12586071808314474819301742

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OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..100

FORMULA

a(n) = (n*(n+2)^n+1)/(n+1).

a(n) ~ exp(2-2/n) * n^n. - Amiram Eldar, Feb 06 2026

MATHEMATICA

Table[(n (n + 2)^n + 1) / (n + 1), {n, 0, 20}] (* Vincenzo Librandi, Jun 21 2013 *)

CROSSREFS

Cf. A083064, A083070, A083071.