Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-1000 pattern in any orientation.
A146648
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =7a(7) =13a(8) =45a(9) =61a(10) =187a(11) =447a(12) =2017a(13) =5419a(14) =35435a(15) =111161a(16) =866245a(17) =3379807a(18) =30738337a(19) =147143823a(20) =1633304661
External references
- oeis: A146648