Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation.
A146246
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =11a(7) =21a(8) =35a(9) =67a(10) =259a(11) =945a(12) =3949a(13) =14269a(14) =69629a(15) =358835a(16) =2304465a(17) =14395141a(18) =109376391a(19) =851675891a(20) =8461569139a(21) =84383219157
External references
- oeis: A146246