n | a(n) |
---|---|
6 | 1 |
7 | 6 |
8 | 42 |
9 | 280 |
10 | 1890 |
11 | 13104 |
12 | 93786 |
13 | 694584 |
14 | 5328180 |
15 | 42336294 |
16 | 348272925 |
17 | 2963993760 |
18 | 26073738236 |
19 | 236857536216 |
20 | 2219777316216 |
21 | 21441389281680 |
22 | 213260412549303 |
23 | 2182163481418536 |
24 | 22951202450444191 |
25 | 247914874683742728 |
[1,6,42,280,1890,13104,93786,694584,5328180, 42336294,348272925,2963993760,26073738236, 236857536216,2219777316216,21441389281680, 213260412549303,2182163481418536, 22951202450444191,247914874683742728] |