Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111 pattern in any orientation.
A146393
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1100-0111 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) =43a(11) =141a(12) =419a(13) =1255a(14) =5087a(15) =24913a(16) =131971a(17) =734375a(18) =4818949a(19) =34664741a(20) =269727721a(21) =2371934855a(22) =24159321229a(23) =274622983853
External references
- oeis: A146393