Number of n X 2 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.
A284216
Number of n X 2 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) =19a(3) =62a(4) =212a(5) =751a(6) =2719a(7) =10002a(8) =37258a(9) =140108a(10) =530646a(11) =2021127a(12) =7733421a(13) =29702087a(14) =114438213a(15) =442099674a(16) =1711885120a(17) =6642102554a(18) =25817134600a(19) =100506778916a(20) =391827603432
External references
- oeis: A284216