A155073 Expansion of (1+6*x)/(1-12*x-8*x^2).

1, 18, 224, 2832, 35776, 451968, 5709824, 72133632, 911282176, 11512455168, 145439719424, 1837376274432, 23212033048576, 293243406778368, 3704617145729024, 46801353002975232, 591253173201534976, 7469448902442221568, 94363412214918938624, 1192116537798565036032

Offset

0,2

Links

Table of n, a(n) for n=0..19.

Tomislav Došlić and Frode Måløy, Chain hexagonal cacti: Matchings and independent sets, Discr. Math., 310 (2010), 1676-1690.

Index entries for linear recurrences with constant coefficients, signature (12,8).

Mathematica

CoefficientList[Series[(1+6x)/(1-12x-8x^2), {x, 0, 20}], x] (* or *) LinearRecurrence[ {12, 8}, {1, 18}, 20]

Crossrefs

Sequence in context: A018911 A021194 A155049 * A153709 A017933 A021384

Adjacent sequences: A155070 A155071 A155072 * A155074 A155075 A155076

Keyword

nonn,easy

Author

N. J. A. Sloane, May 22 2010

Status

approved