237345domain: NAppears in sequencesa(n) = n^4 + 4*n^3 + 12*n^2 + 24*n + 24.at n=21A127878Number of (n+1) X 5 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock equal to the number in all its horizontal and vertical neighbors.at n=26A206263