1,2

a(2)=2*1+1=3; a(3)=2*3-1=5; a(4)=2*5+3=13; a(5)=2*13-3=23; a(6)=2*23+5=51; a(7)=2*51-5=97; ....

a(n)/2^n -> 0.8067474...as n->infinity.

Sequence in context: A014437 A104222 A045414 this_sequence A026733 A005824 A027305

Adjacent sequences: A089064 A089065 A089066 this_sequence A089068 A089069 A089070

easy,nonn

DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Dec 02 2003