606264

Appears in sequences

• Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1<=k<=m positions can be picked in an m X m square grid such that the picked positions don't have any symmetry.at n=31A292152
• G.f. A(x) satisfies: A(x) = A(x^2 - x^5)/x.at n=19A350477