Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-010 pattern in any orientation.
A146244
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 110-111-010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =15a(7) =27a(8) =71a(9) =187a(10) =699a(11) =2485a(12) =10357a(13) =44365a(14) =244417a(15) =1388829a(16) =9098951a(17) =61499491a(18) =509779147a(19) =4539566193a(20) =48133963115a(21) =521951245563
External references
- oeis: A146244