n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 54 |
3 | 1500 |
4 | 51450 |
5 | 2000376 |
6 | 84523824 |
7 | 3789772272 |
8 | 177645575250 |
9 | 8619977394600 |
10 | 429995817814992 |
11 | 21940447761898848 |
12 | 1140809521021467024 |
13 | 60271001744583000000 |
14 | 3228065652622114800000 |
15 | 174953984892890573016000 |
16 | 9580981919014895332205250 |
17 | 529506723911785149640077000 |
18 | 29503054954798945147262250000 |
19 | 1655865088781640962375927700000 |
20 | 93546915429941104997312052606000 |
21 | 5316303408243224817579669328104000 |
[1,3,54,1500,51450,2000376,84523824,3789772272, 177645575250,8619977394600,429995817814992, 21940447761898848,1140809521021467024, 60271001744583000000,3228065652622114800000, 174953984892890573016000, 9580981919014895332205250, 529506723911785149640077000, 29503054954798945147262250000, 1655865088781640962375927700000, 93546915429941104997312052606000, 5316303408243224817579669328104000] |