A167570 The third right hand column of triangle A167569.

6, 80, 1344, 27648, 675840, 19169280, 619315200, 22460497920, 903704739840, 39953262182400, 1925366729932800, 100453916344320000, 5641491941897011200, 339325293097805414400, 21763622246962692096000

Offset: 3

Author

Johannes W. Meijer, Nov 10 2009

Keywords

• easy
• nonn

Links

• G. C. Greubel, Table of n, a(n) for n = 3..150

Crossrefs

Equals the third right hand column of triangle A167569.

Programs

Mathematica

Table[4^(n-3) (n-3)! (2n-3)!/(2n-5)!,{n,3,20}] (* Harvey P. Dale, Nov 27 2011 *)

Formula

a(n) = 4^(n-3)*(n-3)!*(2*n-3)!/(2*n-5)!.