121410

Appears in sequences

• Number of (n+2) X 4 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..1 introduced in row major order.at n=22A204748
• G.f. A(x) satisfies: Sum_{n>=0} x^n * A(x)^(n*(n-1)) = 1/Sum_{n>=0} (-1)^n * x^n * A(x)^(n^2).at n=7A383557