Half the number of (n+2)X4 binary arrays with each 3X3 subblock having sum 4 or 5.
A186818
Half the number of (n+2)X4 binary arrays with each 3X3 subblock having sum 4 or 5.
Terms
- a(0) =606a(1) =3988a(2) =25808a(3) =173121a(4) =1190637a(5) =8178097a(6) =56422648a(7) =390661554a(8) =2704080467a(9) =18732156320a(10) =129837515003a(11) =899875661504
External references
- oeis: A186818