Number of 2 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
A284223
Number of 2 X n 0..1 arrays with the number of 1's horizontally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
Terms
- a(0) =2a(1) =6a(2) =13a(3) =44a(4) =143a(5) =495a(6) =1746a(7) =6399a(8) =23776a(9) =89321a(10) =337909a(11) =1285710a(12) =4914573a(13) =18861581a(14) =72633154a(15) =280492954a(16) =1085801918a(17) =4211904917a(18) =16367963509a(19) =63710308355a(20) =248341387058a(21) =969279971828
External references
- oeis: A284223