id:A127902 - OEIS Search Results

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Series reversion of x/(1+x+x^4).

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1, 1, 1, 1, 2, 6, 16, 36, 75, 163, 391, 991, 2498, 6150, 15016, 37116, 93481, 238137, 607921, 1550401, 3959335, 10155615, 26182267, 67753907, 175713561, 456422121, 1187771521 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`Binomial transform of A002293, with three interpolated zeros (series reversion of x/(1+x^4)).`
	FORMULA	`a(n)=sum{k=0..floor(n/4), C(n,4k)*C(4k,k)/(3k+1)}`
	CROSSREFS	`Adjacent sequences: A127899 A127900 A127901 this_sequence A127903 A127904 A127905` `Sequence in context: A005676 A038503 A079990 this_sequence A053210 A066641 A026540`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 05 2007`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

AT&T Labs Research