73880

Appears in sequences

• Structured tetragonal anti-prism numbers.at n=39A100182
• Number of 2 X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.at n=9A284335
• G.f. satisfies A(x) = x + Product_{n>=2} A(x^n) with A(0) = 1.at n=48A385635