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A155049 G.f.: (1+5*x)/(1-13*x+10*x^2). 0
1, 18, 224, 2732, 33276, 405268, 4935724, 60111732, 732095276, 8916121268, 108588623724, 1322490895732, 16106495407276, 196159531337268, 2389008953311724, 29095521079679732, 354351684502719276, 4315616687738553268, 52559500095573999724, 640117334365076463732 (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.

CROSSREFS

Sequence in context: A017997 A018911 A021194 * A155073 A153709 A017933

Adjacent sequences:  A155046 A155047 A155048 * A155050 A155051 A155052

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 22 2010

STATUS

approved

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Last modified May 21 05:20 EDT 2013. Contains 225474 sequences.