OFFSET
0,4
LINKS
FORMULA
G.f.: (1-x^2)/(1-x-x^2-3*x^3). [corrected by Michel Marcus, Aug 31 2022]
PROG
(Sage) from sage.combinat.sloane_functions import recur_gen3; it = recur_gen3(1, 1, 1, 1, 1, 3); [next(it) for i in range(32)] # Zerinvary Lajos, Jun 25 2008
(PARI) Vec((1-x^2)/(1-x-x^2-3*x^3) + O(x^30)) \\ Michel Marcus, Aug 31 2022
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Oct 06 2004
STATUS
approved