OFFSET
1,2
COMMENTS
LINKS
FORMULA
a(n+2) = 8*a(n+1) - a(n) + 3.
From R. J. Mathar, Oct 24 2008: (Start)
G.f.: x^2*(4 - x)/((1 - x)*(1 - 8*x + x^2)).
a(n) = (A057080(n-1)-1)/2. (End)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Richard Choulet, Oct 14 2008
EXTENSIONS
a(4) corrected, extended, definition corrected by R. J. Mathar, Oct 24 2008
Offset changed by Bruno Berselli, Apr 06 2018
STATUS
approved