id:A143338 - OEIS Search Results

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G.f. satisfies: A(x) = 1 + x*A(x)^3*A(-x).

+0
4

1, 1, 2, 8, 26, 127, 478, 2536, 10250, 56900, 239880, 1370272, 5940054, 34607146, 153018932, 904441648, 4058644842, 24254529036, 110096276440, 663665021280, 3040205250984, 18455364854839, 85176971647470, 520059936017128 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) {a(n)=local(A=1+x+O(x^21)); for(i=0, n, A=1+xA^3subst(A, x, -x)); polcoeff(A, n)}`
	CROSSREFS	`Sequence in context: A150708 A150709 A130613 this_sequence A027267 A060414 A087241` `Adjacent sequences: A143335 A143336 A143337 this_sequence A143339 A143340 A143341`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Aug 09 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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