248505

Appears in sequences

• Number of 3 X n 0..1 arrays with every element equal to 0, 1, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=16A302428
• G.f. A(x) satisfies A(x) = 1 + x^4 * (A(x) / (1 - x))^3.at n=20A364403