Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.
A147322
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 00100-00100-00100-11111 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) =5a(11) =9a(12) =15a(13) =23a(14) =50a(15) =117a(16) =289a(17) =741a(18) =2046a(19) =5466a(20) =16079a(21) =52199a(22) =188773a(23) =719705a(24) =3000618
External references
- oeis: A147322