id:A055219 - OEIS Search Results

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T(2n+3,n), array T as in A055216.

+0
3

1, 5, 21, 78, 274, 927, 3061, 9933, 31824, 100972, 317942, 995088, 3099105, 9612735, 29715525, 91595391, 281643480, 864189486, 2646805668, 8093543439, 24713953515, 75370741506, 229604257846, 698754428388, 2124616182139 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`Apparently a(n)=sum((-1)^jbinomial(n+3, j)binomial(2n+3-3j, n+3), j=0..floor(n/3)). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 13 2004`
	CROSSREFS	`Adjacent sequences: A055216 A055217 A055218 this_sequence A055220 A055221 A055222` `Sequence in context: A014533 A134770 A084780 this_sequence A108863 A027172 A029870`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu), May 07 2000`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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