Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
A146013
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =23a(6) =94a(7) =401a(8) =1988a(9) =14721a(10) =122901a(11) =1562739a(12) =20966035a(13) =411218439a(14) =8595065749a(15) =245851647552
External references
- oeis: A146013