Number of 3 X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.
A228755
Number of 3 X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.
Terms
- a(0) =4a(1) =8a(2) =39a(3) =126a(4) =482a(5) =1712a(6) =6277a(7) =22700a(8) =82580a(9) =299648a(10) =1088499a(11) =3952186a(12) =14352786a(13) =52119040a(14) =189266297a(15) =687294648a(16) =2495834292a(17) =9063317432a(18) =32912374319a(19) =119517358582a(20) =434013128786
External references
- oeis: A228755