Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation.

A146797

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =15a(8) =37a(9) =67a(10) =105a(11) =399a(12) =1261a(13) =4027a(14) =19513a(15) =89607a(16) =517461a(17) =2695467a(18) =14080529a(19) =92973015a(20) =632822045

External references