OFFSET
0,2
LINKS
FORMULA
G.f.: (1+5*x+4*x^2+4*x^3)/(1-3*x^2-4*x^4).
MATHEMATICA
LinearRecurrence[{0, 3, 0, 4}, {1, 5, 7, 19}, 40] (* Georg Fischer, Aug 18 2021 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 03 2015
STATUS
approved