n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 69 |
6 | 348 |
7 | 2016 |
8 | 13357 |
9 | 99376 |
10 | 822040 |
11 | 7477161 |
12 | 74207208 |
13 | 797771520 |
14 | 9236662345 |
15 | 114579019468 |
16 | 1516103040832 |
17 | 21314681315997 |
18 | 317288088082404 |
19 | 4985505271920096 |
20 | 82459612672301845 |
21 | 1432064398910663704 |
22 | 26054771465540507272 |
[0,1,4,16,69,348,2016,13357,99376,822040,7477161, 74207208,797771520,9236662345,114579019468, 1516103040832,21314681315997,317288088082404, 4985505271920096,82459612672301845, 1432064398910663704,26054771465540507272] |