Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
A147329
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =3a(10) =8a(11) =13a(12) =22a(13) =33a(14) =80a(15) =189a(16) =739a(17) =1949a(18) =6380a(19) =15828a(20) =56294a(21) =190233a(22) =1028070a(23) =4302870a(24) =24217353a(25) =101984675
External references
- oeis: A147329