Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
A146066
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =9a(6) =19a(7) =69a(8) =389a(9) =2287a(10) =15081a(11) =141721a(12) =1694175a(13) =23795099a(14) =418616469a(15) =9434924199a(16) =264113682081
External references
- oeis: A146066