OFFSET
0,3
LINKS
Lara Pudwell, Systematic Studies in Pattern Avoidance, 2005.
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
G.f.: 1+x(x^8-4x^7+3x^6+6x^5-13x^4+14x^3-12x^2+5x-1)/(x-1)^7.
For n >= 3, a(n) = (n^6 + 9n^5 - 5n^4 - 405n^3 + 1804n^2 - 684n - 2160)/720. - Franklin T. Adams-Watters, Sep 16 2006
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved