Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
A284159
Number of n X 2 0..1 arrays with the number of 1's horizontally or vertically 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) =4a(2) =13a(3) =42a(4) =134a(5) =467a(6) =1689a(7) =6210a(8) =23178a(9) =87336a(10) =331172a(11) =1262635a(12) =4836199a(13) =18592719a(14) =71697865a(15) =277195002a(16) =1074041216a(17) =4169581090a(18) =16214541562a(19) =63150645344a(20) =246288102302a(21) =961707595682
External references
- oeis: A284159