id:A165205 - OEIS Search Results

Search: id:A165205

Displaying 1-1 of 1 results found.

page 1

a(n)=C(2n-1,n)+C(2n+1,n+1)-C(0,n).

+0
2

1, 4, 13, 45, 161, 588, 2178, 8151, 30745, 116688, 445094, 1704794, 6552378, 25258600, 97617060, 378098955, 1467343305, 5704370760, 22210199550, 86595896310, 338052201630, 1321178419080, 5168764845660, 20240517205350 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Hankel transform is A165206.`
	FORMULA	`G.f.: (1-x)c(x)^2/(1-xc(x)^2)=(1+x)(sqrt(1-4x)+4x-1)/(2sqrt(1-4x)).`
	CROSSREFS	`Sequence in context: A081197 A005490 A035356 this_sequence A149431 A149432 A155397` `Adjacent sequences: A165202 A165203 A165204 this_sequence A165206 A165207 A165208`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 07 2009`

page 1

Search completed in 0.002 seconds

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research