Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.
A147357
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-0110-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =8a(10) =13a(11) =22a(12) =45a(13) =113a(14) =275a(15) =994a(16) =2604a(17) =9935a(18) =31457a(19) =134870a(20) =529162a(21) =2763867a(22) =12621629a(23) =78239209a(24) =410491794a(25) =3050461822
External references
- oeis: A147357