A167570 - OEIS

A167570

The third right hand column of triangle A167569.

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

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OFFSET

3,1

LINKS

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

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

Adjacent sequences: A167567 A167568 A167569 * A167571 A167572 A167573

KEYWORD

easy,nonn

AUTHOR

Johannes W. Meijer, Nov 10 2009

STATUS

approved