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A120756 a(n) = leftmost term of M^n * [1,0,0,0,0,0] where M is the 6 X 6 matrix [1,2,3,4,5,6; 2,3,1,5,6,4; 3,1,2,6,4,5; 4,6,5,1,3,2; 5,4,6,2,1,3; 6,5,4,3,2,1]. 1
1, 91, 1410, 33543, 670734, 14383251, 299383290, 6310987263, 132315428934, 2780561320011, 58374353168370, 1226018323723383, 25744972644839934, 540657134887786371, 11353685448630220650, 238428423877048161903, 5006987636316607975734 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

M is a multiplication table for the symmetric group of degree 3 (S_3).

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..200

Index entries for linear recurrences with constant coefficients, signature (9,225,567).

FORMULA

G.f.: x*(189*x^3-366*x^2-82*x-1) / ((3*x+1)*(9*x+1)*(21*x-1)). [Colin Barker, Dec 13 2012]

EXAMPLE

a(3) = 1410 since M^3 * [1, 0, 0, 0, 0, 0] = [1410, 1428, 1428, 1659, 1659, 1677].

MATHEMATICA

LinearRecurrence[{9, 225, 567}, {1, 91, 1410, 33543}, 20] (* Harvey P. Dale, Apr 11 2018 *)

CROSSREFS

Sequence in context: A221815 A195221 A213559 * A027787 A140667 A221939

Adjacent sequences:  A120753 A120754 A120755 * A120757 A120758 A120759

KEYWORD

nonn,easy

AUTHOR

Gary W. Adamson and Roger L. Bagula, Jul 01 2006

EXTENSIONS

Edited by N. J. A. Sloane, May 06 2010

STATUS

approved

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Last modified December 7 17:41 EST 2019. Contains 329847 sequences. (Running on oeis4.)