The first, 5,  terms of the sequence the number of, 4 by 2*n balaced 0-1 ma\

    trices for n=1 to, n = 5,  are

[6, 90, 1860, 44730, 1172556]

The first, 5,  terms of the sequence the number of, 6 by 2*n balaced 0-1 ma\

    trices for n=1 to, n = 5,  are

[20, 1860, 297200, 60871300, 14367744720]

The first, 5,  terms of the sequence the number of, 8 by 2*n balaced 0-1 ma\

    trices for n=1 to, n = 5,  are

[70, 44730, 60871300, 116963796250, 273957842462220]

The first, 5,  terms of the sequence the number of, 10 by 2*n balaced 0-1 ma\

    trices for n=1 to, n = 5,  are

[252, 1172556, 14367744720, 273957842462220, 6736218287430460752]



This took, 1339.354, seconds.