n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 57 |
3 | 1071 |
4 | 12279 |
5 | 106738 |
6 | 781458 |
7 | 5111986 |
8 | 30980370 |
9 | 178047831 |
10 | 985621119 |
11 | 5311715977 |
12 | 28075774881 |
13 | 146309927344 |
14 | 754544640000 |
15 | 3861338821620 |
16 | 19646614600164 |
17 | 99532074868285 |
18 | 502608221035605 |
19 | 2531829420822835 |
20 | 12730273358124315 |
21 | 63919766245452606 |
[0,1,57,1071,12279,106738,781458,5111986,30980370, 178047831,985621119,5311715977,28075774881, 146309927344,754544640000,3861338821620, 19646614600164,99532074868285,502608221035605, 2531829420822835,12730273358124315, 63919766245452606] |