OFFSET
1,2
LINKS
D. Callan, T. Mansour, Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns, arXiv:1705.00933 (2017), Table 2 No 27.
Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.
Index entries for linear recurrences with constant coefficients, signature (9,-34,69,-78,41,6,-21,11,-2).
FORMULA
G.f.: A(x) = -{(5x^8-12x^7+3x^6+11x^5-26x^4+34x^3-22x^2+7x-1)x}/{(2x-1)(x-1)^6(x^2-1+x)}
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved