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Search: id:A004292
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| A004292 |
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Expansion of (1+2*x+x^2)/(1-18*x+x^2). |
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+0
1
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| 1, 20, 360, 6460, 115920, 2080100, 37325880, 669785740, 12018817440, 215668928180, 3870021889800, 69444725088220, 1246135029698160, 22360985809478660, 401251609540917720, 7200167985927040300
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OFFSET
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0,2
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REFERENCES
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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
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Pairwise sums of A049629.
Sequence in context: A093144 A156455 A089350 this_sequence A053508 A060918 A115100
Adjacent sequences: A004289 A004290 A004291 this_sequence A004293 A004294 A004295
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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