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 180.
MAPLE
C := (1-sqrt(1-4*x))/2/x ;
(1 -7*x +18*x^2 -22*x^3 +16*x^4 -6*x^5 +x^6 -(x -5*x^2 +8*x^3 -2*x^4 -2*x^5 +x^6)*C)/((1 -2*x)*(1 -x)^2*(1 -5*x +4*x^2 -x^3)) ;
taylor(%, x=0, 40) ;
gfun[seriestolist](%) ;
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Nov 09 2017
STATUS
approved