id:A113726 - OEIS Search Results

Search: id:A113726

Displaying 1-1 of 1 results found.

page 1

A Jacobsthal convolution.

+0
2

1, 0, 1, 4, 5, 8, 25, 44, 77, 176, 353, 660, 1365, 2776, 5417, 10876, 21981, 43648, 87153, 175076, 349669, 698280, 1398585, 2797260, 5590381, 11184720, 22373761, 44735284, 89474165, 178969208, 357910345, 715807004, 1431683837, 2863325216 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Convolution of A001045(n+1) and A001607(n+1).`
	FORMULA	`G.f.: 1/((1-x-2x^2)(1+x+2x^2)); a(n)=a(n-2)+4a(n-3)+4a(n-4); a(n)=sum{k=0..floor(n/2), C(n-k, k)2^k*(1+(-1)^(n-k))/2}.`
	CROSSREFS	`Cf. A094686, A089977.` `Sequence in context: A145265 A072808 A104884 this_sequence A140315 A055497 A093088` `Adjacent sequences: A113723 A113724 A113725 this_sequence A113727 A113728 A113729`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Nov 08 2005`

page 1

Search completed in 0.002 seconds

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

AT&T Labs Research