Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
A146032
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =5a(8) =19a(9) =19a(10) =79a(11) =79a(12) =523a(13) =523a(14) =9169a(15) =9169a(16) =183491a(17) =183491a(18) =4964583a(19) =4964583a(20) =219022025a(21) =219022025a(22) =16321424419a(23) =16321424419
External references
- oeis: A146032