Number of nX3 binary arrays indicating whether each 2X2 subblock of a larger binary array has lexicographically nondecreasing rows and columns, for some larger (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.

A227253

Number of nX3 binary arrays indicating whether each 2X2 subblock of a larger binary array has lexicographically nondecreasing rows and columns, for some larger (n+1)X4 binary array with rows and columns of the latter in lexicographically nondecreasing order.