18933352

Appears in sequences

• 4 X 4 square grid graph coloring a rectangular array: number of n X 1 0..15 arrays where 0..15 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=12A223395
• G.f. A(x) satisfies: 1 - x = Sum_{n>=0} (x^(2*n) + (-1)^n*A(x))^n.at n=21A352818