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A081300 Diagonal of square array A081297. 6
1, 5, 55, 481, 10501, 117181, 3879331, 52751105, 2351234953, 37766866501, 2120129149711, 39311679607201, 2663716583547085, 56019878838007085, 4448878347069812251, 104660471059169187841, 9534251497305019644433 (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+3)-(-n)^(n+3))/(2*n+1).

MATHEMATICA

Table[((n + 1)^(n + 3) - (-n)^(n + 3)) / (2 n + 1), {n, 0, 20}] (* Vincenzo Librandi, Aug 07 2013 *)

PROG

(MAGMA) [((n+1)^(n+3)-(-n)^(n+3))/(2*n+1): n in [0..20]]; // Vincenzo Librandi, Aug 07 2013

CROSSREFS

Cf. A081298, A081299, A081301, A081302.

Sequence in context: A015266 A138163 A306095 * A190543 A144894 A247775

Adjacent sequences:  A081297 A081298 A081299 * A081301 A081302 A081303

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Mar 17 2003

STATUS

approved

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Last modified May 24 18:34 EDT 2019. Contains 323534 sequences. (Running on oeis4.)