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 105.
Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.
Index entries for linear recurrences with constant coefficients, signature (10,-40,82,-92,56,-17,2).
FORMULA
G.f.: A(x) = -{x(2x^6-10x^5+31x^4-41x^3+26x^2-8x+1)}/{(2x-1)(x-1)^2(x^2-3x+1)^2}
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved