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A081301 Subdiagonal of square array A081297. 6
1, 1, 13, 41, 991, 5461, 194713, 1545265, 73022131, 758924981, 44709567013, 575279386969, 40614439994311, 623479972408021, 51316625644764721, 915589327332039905, 86090052046429522747, 1750836276286883890741 (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+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3).

MATHEMATICA

Table[((n + 2)^(n + 1) - (-(n + 1))^(n + 1)) / (2 n + 3), {n, 0, 20}] (* Vincenzo Librandi, Aug 08 2013 *)

PROG

(MAGMA) [((n+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3):n in [0..20]]; // Vincenzo Librandi, Aug 08 2013

CROSSREFS

Cf. A081298, A081299, A081300, A081302.

Sequence in context: A116153 A116209 A002673 * A159527 A139277 A162265

Adjacent sequences:  A081298 A081299 A081300 * A081302 A081303 A081304

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Mar 17 2003

STATUS

approved

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)