n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 20 |
3 | 104 |
4 | 468 |
5 | 1960 |
6 | 8020 |
7 | 32424 |
8 | 130388 |
9 | 522920 |
10 | 2094420 |
11 | 8383144 |
12 | 33543508 |
13 | 134195880 |
14 | 536827220 |
15 | 2147396264 |
16 | 8589759828 |
17 | 34359388840 |
18 | 137438254420 |
19 | 549754415784 |
20 | 2199020459348 |
21 | 8796087429800 |
22 | 35184360904020 |
23 | 140737465985704 |
24 | 562949908682068 |
[1,2,20,104,468,1960,8020,32424,130388,522920, 2094420,8383144,33543508,134195880,536827220, 2147396264,8589759828,34359388840,137438254420, 549754415784,2199020459348,8796087429800, 35184360904020,140737465985704,562949908682068] |