OFFSET
1,2
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 2 No 107.
Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.
Index entries for linear recurrences with constant coefficients, signature (8,-25,41,-38,19,-4).
FORMULA
G.f.: A(x) = -{x(4x^5-11x^4+18x^3-15x^2+6x-1)}/{(4x^3-7x^2+5x-1)(x-1)^3}
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved