Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.

A146411

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =21a(8) =45a(9) =89a(10) =233a(11) =863a(12) =3251a(13) =15437a(14) =73625a(15) =393971a(16) =2328247a(17) =15894743a(18) =120359659a(19) =1040197243a(20) =9831811849a(21) =105976019467

External references