Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
A146418
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =1a(10) =4a(11) =1a(12) =9a(13) =3a(14) =31a(15) =9a(16) =107a(17) =21a(18) =365a(19) =62a(20) =1813a(21) =243a(22) =11236a(23) =1174a(24) =84454a(25) =7129a(26) =738542a(27) =48787a(28) =7473236a(29) =396149
External references
- oeis: A146418