Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation.
A146473
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1110-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =5a(8) =11a(9) =17a(10) =47a(11) =105a(12) =423a(13) =1139a(14) =5013a(15) =16157a(16) =89505a(17) =364489a(18) =2547425a(19) =12720065a(20) =106893393a(21) =655837481a(22) =6848268559a(23) =52044360871a(24) =671335193705
External references
- oeis: A146473