Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111 pattern in any orientation.
A146622
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =5a(9) =11a(10) =17a(11) =31a(12) =67a(13) =255a(14) =681a(15) =2579a(16) =7475a(17) =30835a(18) =113699a(19) =646479a(20) =2916183a(21) =18956135a(22) =100069407a(23) =770834039a(24) =4965697461a(25) =47266430445a(26) =367691554109
External references
- oeis: A146622