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A081302
Subdiagonal of square array A081297.
6
1, 1, 21, 61, 1891, 9633, 404713, 2997541, 159902271, 1564345201, 101406750589, 1236882490845, 94479649710811, 1382731226210881, 121677107761110993, 2079381120597925237, 207197254527662127511, 4051708966720224576081
OFFSET
0,3
LINKS
FORMULA
a(n) = ((n+3)^(n+1)-(-(n+2))^(n+1))/(2*n+5).
MATHEMATICA
Table[((n + 3)^(n + 1) - (-(n + 2))^(n + 1)) / (2 n + 5), {n, 0, 20}] (* Vincenzo Librandi, Aug 08 2013 *)
PROG
(Magma) [((n+3)^(n+1)-(-(n+2))^(n+1))/(2*n+5): n in [0..20]]; // Vincenzo Librandi, Aug 08 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 17 2003
STATUS
approved