Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.
A146409
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =9a(9) =19a(10) =33a(11) =73a(12) =235a(13) =975a(14) =4059a(15) =17677a(16) =73575a(17) =388495a(18) =2342809a(19) =17238179a(20) =130497747a(21) =1139591877a(22) =10255691217a(23) =112977046301
External references
- oeis: A146409