79420170240domain: NAppears in sequences1/32 the number of (2n+1) X 4 binary arrays with equal numbers of 2 X 2 subblocks with sum mod two being 0 and 1.at n=4A183766Number of (n+2)X(n+2) binary arrays avoiding patterns 001 and 101 in rows and columns.at n=13A202194