Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.

A146467

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =23a(8) =45a(9) =89a(10) =241a(11) =909a(12) =3431a(13) =17195a(14) =80847a(15) =474101a(16) =2777977a(17) =19564237a(18) =147127789a(19) =1326666153a(20) =12641403749a(21) =144835493185

External references