id:A077936 - OEIS Search Results

Search: id:A077936

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Expansion of 1/(1-2*x-2*x^2-x^3).

+0
2

1, 2, 6, 17, 48, 136, 385, 1090, 3086, 8737, 24736, 70032, 198273, 561346, 1589270, 4499505, 12738896, 36066072, 102109441, 289089922, 818464798, 2317218881, 6560457280, 18573817120, 52585767681, 148879626882, 421504606246, 1193354233937, 3378597307248 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sum of A158687. [From Paul Barry (pbarry(AT)wit.ie), Mar 24 2009]`
	FORMULA	`a(n)=sum{k=0..n, sum{j=0..n-k, C(n-j,k)*C(2k,j)}}. [From Paul Barry (pbarry(AT)wit.ie), Mar 24 2009]`
	CROSSREFS	`Sequence in context: A136776 A018915 A019487 this_sequence A077983 A036365 A052536` `Adjacent sequences: A077933 A077934 A077935 this_sequence A077937 A077938 A077939`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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