Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.
A145945
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =17a(7) =17a(8) =101a(9) =101a(10) =1439a(11) =1439a(12) =45325a(13) =45325a(14) =2541179a(15) =2541179a(16) =249765423a(17) =249765423a(18) =48546882545a(19) =48546882545
External references
- oeis: A145945