263991

Appears in sequences

• Expansion of 1/((1-7x)(1-9x)(1-10x)(1-11x)).at n=4A028225
• Number of solutions to a 4 X n Ring-Ring puzzle on an empty grid.at n=15A360608
• G.f. A(x) satisfies A(x) = 1 + x*(1+x^3)^2*A(x)^3.at n=9A389890