OFFSET
0,3
LINKS
George Spahn, Enumerating solutions to grid based puzzles with a fixed number of rows, arXiv:2202.06234 [math.CO], Feb 2022.
Index entries for linear recurrences with constant coefficients, signature (3,3,-10,-3,5,1).
FORMULA
G.f.: -(2*x^2 + x - 1)*(x^2 + 2*x - 1)/(x^6 + 5*x^5 - 3*x^4 - 10*x^3 + 3*x^2 + 3*x - 1).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
George Spahn, Feb 13 2023
STATUS
approved