Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
A146018
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 2X4 el 1,1 1,2 1,3 1,4 2,4 with any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =13a(6) =41a(7) =219a(8) =1033a(9) =8217a(10) =92671a(11) =1241193a(12) =21102313a(13) =438374597a(14) =11919134635a(15) =429471270295
External references
- oeis: A146018