id:A020699 - OEIS Search Results

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A020699

Expand (1-3x)/(1-5x).

+0
3

1, 2, 10, 50, 250, 1250, 6250, 31250, 156250, 781250, 3906250, 19531250, 97656250, 488281250, 2441406250, 12207031250, 61035156250, 305175781250, 1525878906250, 7629394531250, 38146972656250 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1037`
	FORMULA	`a(n) = 25^(n-1), n > 0.` `E.g.f.: (2exp(5x)+3)/5; a(n)=(25^n+30^n)/5. - Paul Barry (pbarry(AT)wit.ie), Sep 03 2003` `a(n)=sum{k=0..n, C(n-1, k)(Jac(2n-2k)+Jac(2n-2k-1))}+0^n/2, Jac(n)=A001045(n). - Paul Barry (pbarry(AT)wit.ie), Jun 07 2005`
	CROSSREFS	`Adjacent sequences: A020696 A020697 A020698 this_sequence A020700 A020701 A020702` `Sequence in context: A015945 A015954 A015949 this_sequence A020729 A110170 A026332`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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