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A004291
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Expansion of (1+2*x+x^2)/(1-10*x+x^2).
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1
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1, 12, 120, 1188, 11760, 116412, 1152360, 11407188, 112919520, 1117788012, 11064960600, 109531817988, 1084253219280, 10733000374812, 106245750528840, 1051724504913588, 10410999298607040, 103058268481156812
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| J. M. Alonso, Growth functions of amalgams, in Alperin, ed., Arboreal Group Theory, Springer, pp. 1-34, esp. p. 32.
P. de la Harpe, Topics in Geometric Group Theory, Univ. Chicago Press, 2000, p. 160, middle display.
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CROSSREFS
| Pairwise sums of A054320.
Sequence in context: A004332 A129329 A129332 * A001754 A037511 A037694
Adjacent sequences: A004288 A004289 A004290 * A004292 A004293 A004294
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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