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A155073
Expansion of (1+6*x)/(1-12*x-8*x^2).
0
1, 18, 224, 2832, 35776, 451968, 5709824, 72133632, 911282176, 11512455168, 145439719424, 1837376274432, 23212033048576, 293243406778368, 3704617145729024, 46801353002975232, 591253173201534976, 7469448902442221568, 94363412214918938624, 1192116537798565036032
OFFSET
0,2
LINKS
Tomislav Došlić and Frode Måløy, Chain hexagonal cacti: Matchings and independent sets, Discr. Math., 310 (2010), 1676-1690.
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
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 22 2010
STATUS
approved