Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.
A146926
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1001-1111-1001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =5a(6) =9a(7) =17a(8) =89a(9) =140a(10) =1134a(11) =2523a(12) =20495a(13) =73514a(14) =534008a(15) =1996987a(16) =23508472a(17) =92663083a(18) =1862869380a(19) =7762461636a(20) =266742576438
External references
- oeis: A146926