Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation.
A146378
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =1a(10) =5a(11) =1a(12) =16a(13) =5a(14) =66a(15) =13a(16) =195a(17) =31a(18) =1006a(19) =121a(20) =6245a(21) =491a(22) =48466a(23) =3357a(24) =493217a(25) =25639a(26) =5217946a(27) =206564a(28) =68677904a(29) =2153667
External references
- oeis: A146378