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A167570
The third right hand column of triangle A167569.
3
6, 80, 1344, 27648, 675840, 19169280, 619315200, 22460497920, 903704739840, 39953262182400, 1925366729932800, 100453916344320000, 5641491941897011200, 339325293097805414400, 21763622246962692096000
OFFSET
3,1
LINKS
FORMULA
a(n) = 4^(n-3)*(n-3)!*(2*n-3)!/(2*n-5)!.
MATHEMATICA
Table[4^(n-3) (n-3)! (2n-3)!/(2n-5)!, {n, 3, 20}] (* Harvey P. Dale, Nov 27 2011 *)
CROSSREFS
Equals the third right hand column of triangle A167569.
Sequence in context: A229574 A240409 A275137 * A337564 A177776 A349528
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Nov 10 2009
STATUS
approved