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A155073 G.f.: (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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

T. Doslic and F. Maloy, Chain hexagonal cacti ..., Discr. Math., 310 (2010), 1676-1690.

LINKS

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

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

CROSSREFS

Sequence in context: A018911 A021194 A155049 * A153709 A017933 A021384

Adjacent sequences:  A155070 A155071 A155072 * A155074 A155075 A155076

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 22 2010

STATUS

approved

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Last modified May 24 15:25 EDT 2019. Contains 323532 sequences. (Running on oeis4.)