90864

Appears in sequences

• Number of (n+2) X (2+2) 0..1 arrays with every 2 X 2 and 3X3 subblock diagonal maximum minus antidiagonal minimum nondecreasing horizontally and vertically.at n=32A253504
• a(n) = A000203(A251720(n)).at n=13A268733
• Number of triangular regions in a "frame" of size n X n (see Comments in A331776 for definition), divided by 4.at n=31A332595