id:A127769 - OEIS Search Results

Search: id:A127769

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a(n)=3*C(4n-2,2n)/(2n+1)-2*0^n.

+0
3

1, 1, 9, 90, 1001, 11934, 149226, 1931540, 25662825, 347993910, 4796857230, 67016296620, 946844533674, 13505406670700, 194214400834356, 2812744285440936, 40989428837821289 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(n)=A127768(2n).`
	CROSSREFS	`Sequence in context: A098399 A082367 A049389 this_sequence A062815 A128384 A077334` `Adjacent sequences: A127766 A127767 A127768 this_sequence A127770 A127771 A127772`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 28 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research