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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
OFFSET
0,2
LINKS
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
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 17 2003
STATUS
approved