id:A092808 - OEIS Search Results

Search: id:A092808

Displaying 1-1 of 1 results found.

page 1

Pair reversal of Jacobsthal numbers.

+0
5

1, 0, 3, 1, 11, 5, 43, 21, 171, 85, 683, 341, 2731, 1365, 10923, 5461, 43691, 21845, 174763, 87381, 699051, 349525, 2796203, 1398101, 11184811, 5592405, 44739243, 22369621, 178956971, 89478485, 715827883, 357913941, 2863311531, 1431655765 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(2n)=A001045(2n+1); a(2n+1)=A001045(2n) a(2n+2)=a(2n)+2*4^n; a(2n+3)=a(2n+1)+4^n.`
	FORMULA	`G.f.: (1+x-x^2)/((1+x)(1-2x)(1+2x)); E.g.f.: exp(-2x)/4+5exp(2x)/12+exp(-x)/3=cosh(2x)/2+exp(2x)/6+exp(-x)/3; a(n)=(-2)^n/4+5*2^n/12+(-1)^n/3.`
	CROSSREFS	`Sequence in context: A165674 A027446 A027516 this_sequence A113955 A110165 A111965` `Adjacent sequences: A092805 A092806 A092807 this_sequence A092809 A092810 A092811`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 10 2004`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research