id:A116390 - OEIS Search Results

Search: id:A116390

Displaying 1-1 of 1 results found.

page 1

Expansion of 1/(2*sqrt(1-4x^2)-x-1).

+0
2

1, 1, 5, 9, 33, 73, 233, 569, 1693, 4353, 12477, 32985, 92637, 248673, 690549, 1869513, 5158881, 14033161, 38587193, 105246041, 288818305, 788939769, 2162574513, 5912375033, 16196093881, 44300854441, 121311490937 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..n,sum{j=0..k, C(k,j)(-1)^(k-j)*sum{i=0..floor(n/2), C(i+(j-1)/2,i)C(j,n-2i)4^i}}}.`
	EXAMPLE	`Row sums of number triangle A116389.`
	CROSSREFS	`Sequence in context: A049602 A119031 A034435 this_sequence A028351 A098640 A083832` `Adjacent sequences: A116387 A116388 A116389 this_sequence A116391 A116392 A116393`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 12 2006`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research