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Search: id:A158826
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| A158826 |
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Third iteration of x*C(x) where C(x) is the Catalan function (A000108). |
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+0
5
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| 1, 3, 12, 54, 260, 1310, 6824, 36478, 199094, 1105478, 6227712, 35520498, 204773400, 1191572004, 6990859416, 41313818217, 245735825082, 1470125583756, 8840948601024, 53417237877396, 324123222435804, 1974317194619712
(list; graph; listen)
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OFFSET
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1,2
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PROGRAM
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(PARI) {a(n)=local(F=serreverse(x-x^2+O(x^(n+1))), G=x); for(i=1, 3, G=subst(F, x, G)); polcoeff(G, n)}
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CROSSREFS
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Cf. A158825, A158827, A158828, A158829.
Sequence in context: A125188 A054666 A006026 this_sequence A107264 A052673 A042971
Adjacent sequences: A158823 A158824 A158825 this_sequence A158827 A158828 A158829
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Mar 28 2009
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