The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A081301 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A081301

Subdiagonal of square array A081297.
(history; published version)

#6 by Charles R Greathouse IV at Thu Sep 08 08:45:09 EDT 2022

PROG

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

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#5 by Alois P. Heinz at Thu Aug 08 06:04:21 EDT 2013

STATUS

proposed

approved

#4 by Vincenzo Librandi at Thu Aug 08 01:36:19 EDT 2013

STATUS

editing

proposed

#3 by Vincenzo Librandi at Thu Aug 08 01:36:10 EDT 2013

LINKS

Vincenzo Librandi, <a href="/A081301/b081301.txt">Table of n, a(n) for n = 0..200</a>

FORMULA

a(n) = ((n+2)^(n+1)-(-(n+1))^(n+1))/(2n2*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

STATUS

approved

editing

#2 by Russ Cox at Fri Mar 30 18:58:48 EDT 2012

AUTHOR

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

Discussion

Fri Mar 30

18:58

OEIS Server: https://oeis.org/edit/global/287

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

Subdiagonal of square array A081297.

DATA

1, 1, 13, 41, 991, 5461, 194713, 1545265, 73022131, 758924981, 44709567013, 575279386969, 40614439994311, 623479972408021, 51316625644764721, 915589327332039905, 86090052046429522747, 1750836276286883890741

OFFSET

0,3

FORMULA

a(n)=((n+2)^(n+1)-(-(n+1))^(n+1))/(2n+3).

CROSSREFS

Cf. A081298, A081299, A081300, A081302.

KEYWORD

easy,nonn

AUTHOR

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

STATUS

approved