OFFSET
0,2
LINKS
J. P. S. Kung and A. de Mier, Catalan lattice paths with rook, bishop and spider steps, Journal of Combinatorial Theory, Series A 120 (2013) 379-389.
FORMULA
Kung and de Mier give a g.f.
MAPLE
g := (3*t^2-t-1+sqrt(1-14*t+35*t^2-30*t^3+9*t^4))/4/t/(3*t-2) ;
taylor(%, t=0, 40) ;
seq(coeftayl(%, t=0, n), n=0..39) ; # R. J. Mathar, Jan 30 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 27 2012
STATUS
approved