188290

Appears in sequences

• Number of 4 X n 0..1 arrays avoiding 0 0 1 and 1 0 1 horizontally and 0 1 0 and 1 0 1 vertically.at n=18A207255
• Irregular triangle read by rows: T(n,i) = number of n X n semi-canonical binary matrices with exactly i 1's, where 0 <= i <= n^2.at n=74A268523