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A081299 Diagonal of square array A081297. 6
1, 3, 13, 181, 1281, 32551, 314245, 11638089, 141943681, 6914792611, 101829922701, 6152865979261, 106138316846017, 7657555132292703, 151395000617362741, 12699162274678909201, 283052059672669084161 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

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

MATHEMATICA

Table[((n + 1)^(n + 2) - (-n)^(n + 2)) / (2 n + 1), {n, 0, 20}] (* Vincenzo Librandi, Aug 08 2013 *)

PROG

(MAGMA) [((n+1)^(n+2)-(-n)^(n+2))/(2*n+1): n in [0..20]]; // Vincenzo Librandi, Aug 08 2013

CROSSREFS

Cf. A081298, A081300, A081301, A081302.

Sequence in context: A114317 A168320 A323134 * A117808 A002065 A302143

Adjacent sequences:  A081296 A081297 A081298 * A081300 A081301 A081302

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Mar 17 2003

STATUS

approved

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Last modified May 25 11:17 EDT 2019. Contains 323539 sequences. (Running on oeis4.)