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A052820
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A simple grammar.
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1
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1, 2, 9, 62, 572, 6604, 91526, 1480044, 27353448, 568731648, 13138994112, 333895239072, 9256507508112, 278000959058016, 8991458660924112, 311585506208924064, 11517363473843526912, 452332548042633835776
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| Thitsa, M.; Gray, W. S.; On the radius of convergence of cascaded analytic nonlinear systems: The SISO case, System Theory (SSST), 2011 IEEE 43rd Southeastern Symposium on, 14-16 March 2011, pp. 30-36.
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 785
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FORMULA
| E.g.f.: -1/(-1+x+ln(-1/(-1+x)))
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MAPLE
| spec := [S, {C=Cycle(Z), B=Union(C, Z), S=Sequence(B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A146887 A173498 A113662 * A100262 A166886 A003577
Adjacent sequences: A052817 A052818 A052819 * A052821 A052822 A052823
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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