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A081298 Main diagonal of the square array A081297. 6
1, 1, 7, 25, 461, 2821, 84883, 734161, 30684601, 342800821, 18348174791, 251203133545, 16394732478853, 265727053328101, 20464206411678331, 383172119935376161, 34011762638354230001, 722380674949394645269 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

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

MATHEMATICA

Table[((n + 1)^(n + 1) - (-n)^(n + 1)) / (2 n + 1), {n, 0, 20}] (* Vincenzo Librandi, Aug 07 2013 *)

PROG

(MAGMA) [((n+1)^(n+1)-(-n)^(n+1))/(2*n+1): n in [0..20]]; // Vincenzo Librandi, Aug 07 2013

CROSSREFS

Cf. A081299, A081300, A081301, A081302.

Sequence in context: A231579 A197721 A261421 * A318633 A300527 A214593

Adjacent sequences:  A081295 A081296 A081297 * A081299 A081300 A081301

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Mar 17 2003

STATUS

approved

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Last modified June 20 00:47 EDT 2019. Contains 324223 sequences. (Running on oeis4.)