Number of 2n X 6 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
A198280
Number of 2n X 6 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =2a(1) =14a(2) =100a(3) =662a(4) =4588a(5) =31718a(6) =219060a(7) =1516006a(8) =10490668a(9) =72598710a(10) =502455316a(11) =3477498838a(12) =24068002412a(13) =166577135174
External references
- oeis: A198280