id:A132228 - OEIS Search Results

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a(n) = Sum_{k=0..n} C(n-1,k)^2*a(k)*a(n-k-1) for n>0 with a(0)=1.

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1, 1, 2, 8, 52, 504, 6808, 122304, 2820048, 81183200, 2853990496, 120321094656, 5991955466560, 347996920977664, 23312947041336960, 1784445116557881344, 154767015393810489600, 15098457734490931766784 (list; graph; listen)

	OFFSET	`0,3`
	PROGRAM	`(PARI) a(n)=if(n==0, 1, sum(k=0, n-1, a(k)a(n-k-1)binomial(n-1, k)^2 ))`
	CROSSREFS	`Cf. A001059.` `Adjacent sequences: A132225 A132226 A132227 this_sequence A132229 A132230 A132231` `Sequence in context: A006351 A089467 A103239 this_sequence A057629 A079503 A052694`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Aug 15 2007`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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