n | a(n) |
---|---|
2 | 3 |
3 | 10 |
4 | 45 |
5 | 270 |
6 | 1737 |
7 | 13280 |
8 | 121500 |
9 | 1231200 |
10 | 12994020 |
11 | 151817274 |
12 | 2041564500 |
13 | 29351808000 |
14 | 448218360000 |
15 | 7027147872000 |
16 | 118449530725500 |
17 | 2207253791691000 |
18 | 43402342378752000 |
19 | 889018706142000000 |
20 | 19030271359352400000 |
[3,10,45,270,1737,13280,121500,1231200,12994020, 151817274,2041564500,29351808000,448218360000, 7027147872000,118449530725500,2207253791691000, 43402342378752000,889018706142000000, 19030271359352400000] |