Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0010 pattern in any orientation.
A146401
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1111-0010 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) =33a(11) =77a(12) =239a(13) =919a(14) =3879a(15) =17353a(16) =75579a(17) =398897a(18) =2332505a(19) =16656293a(20) =126029691a(21) =1117371931a(22) =10274166583
External references
- oeis: A146401