n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 15 |
5 | 48 |
6 | 310 |
7 | 1440 |
8 | 11970 |
9 | 85120 |
10 | 821016 |
11 | 7257600 |
12 | 91707000 |
13 | 958003200 |
14 | 13440913200 |
15 | 178919989248 |
16 | 2809456650000 |
17 | 41845579776000 |
18 | 763629026160000 |
19 | 12804747411456000 |
20 | 257140635922025856 |
21 | 4918792391884800000 |
22 | 106876408948152480000 |
[1,2,4,15,48,310,1440,11970,85120,821016,7257600, 91707000,958003200,13440913200,178919989248, 2809456650000,41845579776000,763629026160000, 12804747411456000,257140635922025856, 4918792391884800000,106876408948152480000] |