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

A146573

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

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =9a(6) =27a(7) =93a(8) =387a(9) =2257a(10) =17737a(11) =161709a(12) =1791979a(13) =24472267a(14) =411254805a(15) =8803299545a(16) =237567838361

External references