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A155542 G.f.: (2+2*x)/(1-8*x-25*x^2). 0
2, 18, 194, 2002, 20866, 216978, 2257474, 23484242, 244310786, 2541592338, 26440508354, 275063875282, 2861523711106, 29768786570898, 309688385344834, 3221726747031122, 33516023609869826, 348671357554736658, 3627271450684638914, 37734955544345527762 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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 (8, 25).

CROSSREFS

Sequence in context: A138413 A066274 A052623 * A157765 A156341 A262718

Adjacent sequences:  A155539 A155540 A155541 * A155543 A155544 A155545

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 22 2010

STATUS

approved

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Last modified November 15 15:59 EST 2018. Contains 317239 sequences. (Running on oeis4.)