id:A158268 - OEIS Search Results

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a(n) = coefficient of x^n in the (2^(n-1))-th iteration of x*C(x) where C(x) is the Catalan function (A000108), for n>=1.

+0
2

1, 2, 20, 684, 84864, 40783952, 78562790592, 613738473236928, 19459342629747109248, 2496653806284295319455488, 1291725241770954532057108070400, 2687434858858114549619735481969223680 (list; graph; listen)

	OFFSET	`1,2`
	PROGRAM	`(PARI) {a(n)=local(G=serreverse(x-x^2+O(x^(n+2)))); for(i=2, n, G=subst(G, x, G)); polcoeff(G, n)}`
	CROSSREFS	`Cf. A158269, A000108, A158825.` `Sequence in context: A015207 A054941 A012495 this_sequence A163594 A013148 A006547` `Adjacent sequences: A158265 A158266 A158267 this_sequence A158269 A158270 A158271`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 28 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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