n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 17 |
4 | 140 |
5 | 1623 |
6 | 23688 |
7 | 414292 |
8 | 8408768 |
9 | 193891685 |
10 | 5001814400 |
11 | 142675793706 |
12 | 4458289724928 |
13 | 151440666806527 |
14 | 5556047001924608 |
15 | 218947599027613688 |
16 | 9223382498249719808 |
17 | 413620308786882430089 |
18 | 19673207238835121651712 |
19 | 989209888652706998977990 |
20 | 52428801216451004088320000 |
[1,1,3,17,140,1623,23688,414292,8408768,193891685, 5001814400,142675793706,4458289724928, 151440666806527,5556047001924608, 218947599027613688,9223382498249719808, 413620308786882430089,19673207238835121651712, 989209888652706998977990, 52428801216451004088320000] |