OFFSET
1,3
FORMULA
G.f.: Sum((1-x)^2*x^(2*n-1)/((1-2*x+x^(2*n-1))*(1-2*x+x^(2*n))), n=1..infinity).
a(n) + A103422(n) = 2^(n-1). - R. J. Mathar, Mar 24 2018
MATHEMATICA
Rest[ CoefficientList[ Series[ Expand[ Sum[(1 - x)^2*x^(2n - 1)/((1 - 2x + x^(2n - 1))*(1 - 2x + x^(2n))), {n, 35}]], {x, 0, 35}], x]] (* Robert G. Wilson v, Feb 05 2005 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Feb 04 2005
EXTENSIONS
More terms from Robert G. Wilson v, Feb 05 2005
STATUS
approved