id:A135758 - OEIS Search Results

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Catalan numbers at triangular positions: a(n) = A000108(n(n+1)/2).

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1, 1, 5, 132, 16796, 9694845, 24466267020, 263747951750360, 11959798385860453492, 2257117854077248073253720, 1759414616608818870992479875972, 5632681584560312734993915705849145100 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = C(n(n+1), n(n+1)/2) / [n(n+1)/2 + 1].`
	PROGRAM	`(PARI) a(n)=binomial(n(n+1), n(n+1)/2)/(n*(n+1)/2+1)`
	CROSSREFS	`Cf. A135757.` `Sequence in context: A142892 A070247 A003372 this_sequence A053517 A114474 A085506` `Adjacent sequences: A135755 A135756 A135757 this_sequence A135759 A135760 A135761`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Dec 02 2007`

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Last modified July 23 10:48 EDT 2008. Contains 142285 sequences.

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