OFFSET
0,3
LINKS
D. Callan, T. Mansour, Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns, arXiv:1705.00933 [math.CO] (2017), Table 1 No 172.
MAPLE
C := (1-sqrt(1-4*x))/2/x ;
((2 -10*x +16*x^2 -8*x^3 +x^4)*C -1 +4*x -5*x^2 +x^3)/((1 -x)^2*(1 -3*x + x^2)) ;
taylor(%, x=0, 40) ;
gfun[seriestolist](%) ;
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Nov 09 2017
STATUS
approved