Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.
A146664
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =19a(8) =43a(9) =87a(10) =303a(11) =1077a(12) =3757a(13) =15681a(14) =80673a(15) =475263a(16) =2975253a(17) =20229343a(18) =160250909a(19) =1366441107a(20) =13345035623
External references
- oeis: A146664