n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 22 |
5 | 88 |
6 | 374 |
7 | 1668 |
8 | 7744 |
9 | 37182 |
10 | 183666 |
11 | 929480 |
12 | 4803018 |
13 | 25274088 |
14 | 135132886 |
15 | 732779504 |
16 | 4023875702 |
17 | 22346542912 |
18 | 125368768090 |
19 | 709852110576 |
20 | 4053103780006 |
21 | 23320440656376 |
22 | 135126739754922 |
23 | 788061492048436 |
24 | 4623591001082002 |
25 | 27277772831911348 |
[1,1,2,6,22,88,374,1668,7744,37182,183666,929480, 4803018,25274088,135132886,732779504,4023875702, 22346542912,125368768090,709852110576, 4053103780006,23320440656376,135126739754922, 788061492048436,4623591001082002, 27277772831911348] |