Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.
A147408
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1001-1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =13a(8) =25a(9) =49a(10) =175a(11) =865a(12) =4191a(13) =18461a(14) =94551a(15) =650857a(16) =5436423a(17) =49032533a(18) =472638523a(19) =5306220921a(20) =72329183333
External references
- oeis: A147408