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A081299 Diagonal of square array A081297. 5
1, 3, 13, 181, 1281, 32551, 314245, 11638089, 141943681, 6914792611, 101829922701, 6152865979261, 106138316846017, 7657555132292703, 151395000617362741, 12699162274678909201, 283052059672669084161 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

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

CROSSREFS

Cf. A081298, A081300, A081301, A081302.

Sequence in context: A176315 A114317 A168320 * A117808 A002065 A087601

Adjacent sequences:  A081296 A081297 A081298 * A081300 A081301 A081302

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 17 2003

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.