Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.
A286973
Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.
Terms
- a(0) =0a(1) =0a(2) =5a(3) =30a(4) =126a(5) =520a(6) =2088a(7) =8192a(8) =32083a(9) =125728a(10) =492331a(11) =1927334a(12) =7545086a(13) =29542032a(14) =115713230a(15) =453479812a(16) =1778221568a(17) =6976989468a(18) =27390464896a(19) =107590106636a(20) =422842742731
External references
- oeis: A286973