Number of (n+1)X4 binary arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.

A186896

Number of (n+1)X4 binary arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.

Terms

    a(0) =76a(1) =140a(2) =444a(3) =1692a(4) =3948a(5) =13894a(6) =35270a(7) =122820a(8) =328174a(9) =1091770a(10) =2989514a(11) =9789230a(12) =27386704a(13) =88043136a(14) =249821778a(15) =792963658a(16) =2277817920a(17) =7153114096a(18) =20739269674a(19) =64581466696a(20) =188672537578a(21) =583564854384

External references