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A167558 The second right hand column of triangle A167557. 3
1, 12, 160, 2688, 55296, 1351680, 38338560, 1238630400, 44920995840, 1807409479680, 79906524364800, 3850733459865600, 200907832688640000, 11282983883794022400, 678650586195610828800, 43527244493925384192000 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

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.

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

MATHEMATICA

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

CROSSREFS

A167546 is the ED1 array.

Equals the second right hand column of triangle A167557.

Sequence in context: A208791 A019578 A144346 * A048609 A048603 A275040

Adjacent sequences:  A167555 A167556 A167557 * A167559 A167560 A167561

KEYWORD

easy,nonn

AUTHOR

Johannes W. Meijer, Nov 10 2009

STATUS

approved

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Last modified March 26 07:24 EDT 2017. Contains 284111 sequences.