Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.
A146009
Number of n X n binary arrays symmetric about main diagonal 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) =3a(5) =9a(6) =22a(7) =75a(8) =380a(9) =2417a(10) =17011a(11) =150387a(12) =1725197a(13) =24767029a(14) =439881987a(15) =9753623996a(16) =269467512241
External references
- oeis: A146009