Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

A146654

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =7a(9) =15a(10) =33a(11) =67a(12) =183a(13) =469a(14) =1433a(15) =5417a(16) =21723a(17) =100185a(18) =477751a(19) =2441485a(20) =14323245a(21) =87372485

External references