OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (4, -3, -4, 4).
FORMULA
G.f.: 1/(1-x) + 1/(3*(1+x)) - 1/(3*(1-2*x)) + 8*x/(1-2*x)^2. [Richard Choulet, Apr 04 2010]
a(n) = 3*A113861(n+1) + 1. - Michel Marcus, Feb 05 2019
PROG
(PARI) a(n) = 1 + ((6*n-1)*2^n+(-1)^n)/3; \\ Michel Marcus, Feb 05 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Fernando J. Ballesteros (fernando.ballesteros(AT)uv.es), Mar 30 2010
EXTENSIONS
More terms from Michel Marcus, Feb 05 2019
STATUS
approved