Number of n X n binary arrays, symmetric about main diagonal, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
A144239
Number of n X n binary arrays, symmetric about main diagonal, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =9a(4) =28a(5) =108a(6) =984a(7) =7649a(8) =73052a(9) =1440611a(10) =30613610a(11) =770498233a(12) =33712608974
External references
- oeis: A144239