A081299 Diagonal of square array A081297.

1, 3, 13, 181, 1281, 32551, 314245, 11638089, 141943681, 6914792611, 101829922701, 6152865979261, 106138316846017, 7657555132292703, 151395000617362741, 12699162274678909201, 283052059672669084161

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: A168320 A323134 A368499 * A117808 A002065 A302143

Adjacent sequences: A081296 A081297 A081298 * A081300 A081301 A081302

Keyword

easy,nonn

Author

Paul Barry, Mar 17 2003

Status

approved