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A158827 The 4th iteration of x*C(x) where C(x) is the Catalan function (A000108). 4
1, 4, 20, 110, 640, 3870, 24084, 153306, 993978, 6544242, 43652340, 294469974, 2006018748, 13784115468, 95444016984, 665407010349, 4667570034444, 32922870719664, 233389493503968, 1662048903052380, 11885333877149532 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

Elżbieta Liszewska, Wojciech Młotkowski, Some relatives of the Catalan sequence, arXiv:1907.10725 [math.CO], 2019.

PROG

(PARI) {a(n)=local(F=serreverse(x-x^2+O(x^(n+1))), G=x); for(i=1, 4, G=subst(F, x, G)); polcoeff(G, n)}

CROSSREFS

Cf. A158825, A158826, A158828, A158829.

Sequence in context: A271932 A153295 A006770 * A263854 A026156 A025183

Adjacent sequences:  A158824 A158825 A158826 * A158828 A158829 A158830

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 28 2009

STATUS

approved

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Last modified November 19 16:06 EST 2019. Contains 329320 sequences. (Running on oeis4.)