A167558 The second right hand column of triangle A167557.

1, 12, 160, 2688, 55296, 1351680, 38338560, 1238630400, 44920995840, 1807409479680, 79906524364800, 3850733459865600, 200907832688640000, 11282983883794022400, 678650586195610828800, 43527244493925384192000

Offset: 2

Author

Johannes W. Meijer, Nov 10 2009

Keywords

• easy
• nonn

Comments

Triangle A167557 is the lower left triangle of the ED1 array A167546.

Links

• G. C. Greubel, Table of n, a(n) for n = 2..150
• A. Ryabov, P. Chvosta, Tracer dynamics in a single-file system with absorbing boundary, arXiv preprint arXiv:1402.1949 [cond-mat.stat-mech], 2014.

Crossrefs

A167546 is the ED1 array.

Equals the second right hand column of triangle A167557.

Programs

Mathematica

Table[4^(n-2) (n-2)! (2n-3)!/(2n-4)!,{n,2,20}] (* Harvey P. Dale, Aug 21 2013 *)

Formula

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

(-2*n+5)*a(n) +4*(2*n-3)*(n-2)*a(n-1)=0. - R. J. Mathar, Apr 01 2015