Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.
A146221
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 101-111-010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =4a(9) =1a(10) =8a(11) =3a(12) =27a(13) =9a(14) =104a(15) =20a(16) =436a(17) =63a(18) =2340a(19) =272a(20) =15459a(21) =1557a(22) =131790a(23) =10412a(24) =1346197a(25) =77761a(26) =16419748a(27) =729051a(28) =247609178a(29) =8641753
External references
- oeis: A146221