Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 111-110-111 pattern in any orientation.
A146285
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 111-110-111 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) =11a(13) =5a(14) =29a(15) =13a(16) =127a(17) =25a(18) =445a(19) =59a(20) =1927a(21) =333a(22) =10103a(23) =1935a(24) =78527a(25) =9121
External references
- oeis: A146285