n | a(n) |
---|---|
4 | 1 |
5 | 10 |
6 | 65 |
7 | 420 |
8 | 3157 |
9 | 27342 |
10 | 264925 |
11 | 2831455 |
12 | 33077539 |
13 | 419262987 |
14 | 5730379473 |
15 | 84009491475 |
16 | 1315019717433 |
17 | 21890336017248 |
18 | 386143234692768 |
19 | 7195289865439824 |
20 | 141228388872794736 |
21 | 2912462945497687680 |
22 | 62959048637195335680 |
23 | 1423638554827333204800 |
[1,10,65,420,3157,27342,264925,2831455,33077539, 419262987,5730379473,84009491475,1315019717433, 21890336017248,386143234692768,7195289865439824, 141228388872794736,2912462945497687680, 62959048637195335680,1423638554827333204800] |