Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111 pattern in any orientation.
A146726
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =27a(10) =51a(11) =141a(12) =615a(13) =2523a(14) =10593a(15) =40853a(16) =196793a(17) =1114237a(18) =8094209a(19) =59485011a(20) =492771709a(21) =4132732207a(22) =42832582765a(23) =478558556527
External references
- oeis: A146726