id:A123392 - OEIS Search Results

Search: id:A123392

Displaying 1-1 of 1 results found.

page 1

a(-3)=a(-2)=a(-1)=0, a(0)=1, a(n)=a(n-1)+2*a(n-2)+2*a(n-3)+a(n-4)for n>0.

+0
3

0, 0, 0, 1, 1, 3, 7, 16, 37, 86, 199, 461, 1068, 2474, 5731, 13276, 30754, 71242, 165033, 382301, 885605, 2051515, 4752360, 11008901, 25502256, 59076293, 136850967, 317016966, 734373742, 1701185901, 3940818284, 9128954536, 21147336648 (list; graph; listen)

	OFFSET	`-3,6`
	FORMULA	`a(n)=Sum_{k, 0<=k<=[n/2]}A016095(n-k,k) . G.f. : 1/(1-x-2x^2-2x^3-x^4)`
	CROSSREFS	`Sequence in context: A033303 A078056 A124671 this_sequence A130691 A095263 A010912` `Adjacent sequences: A123389 A123390 A123391 this_sequence A123393 A123394 A123395`
	KEYWORD	`nonn`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 14 2006`

page 1

Search completed in 0.002 seconds

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research