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A004293
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Expansion of (1+2*x+x^2)/(1-26*x+x^2).
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0
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1, 28, 728, 18900, 490672, 12738572, 330712200, 8585778628, 222899532128, 5786802056700, 150233953942072, 3900296000437172, 101257462057424400, 2628793717492597228, 68247379192750103528, 1771803065294010094500
(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
| Sequence in context: A070310 A160141 A185987 * A012808 A097834 A162830
Adjacent sequences: A004290 A004291 A004292 * A004294 A004295 A004296
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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