OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..201 [offset shifted by Georg Fischer, May 11 2021]
FORMULA
MATHEMATICA
Table[(n + 1)! (n - 1)! (2 n + 1) / 3!, {n, 1, 30}] (* Vincenzo Librandi Jul 04 2018 *)
PROG
(PARI) a(n) = { (n + 1)!*(n - 1)!*(2*n + 1)/6 } \\ Harry J. Smith, Jul 01 2009
(Magma) [Factorial(n+1) * Factorial(n-1) * (2*n+1)/6: n in [1..20]]; // Vincenzo Librandi, Jul 05 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Wolfdieter Lang, Mar 16 2001
EXTENSIONS
Offset changed from 0 to 1 by Georg Fischer, May 09 2021
STATUS
approved