1/32 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.

A183766

1/32 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.

Terms

    a(0) =40a(1) =7392a(2) =1555840a(3) =346131968a(4) =79420170240

External references