n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 18 |
4 | 136 |
5 | 1625 |
6 | 23436 |
7 | 412972 |
8 | 8390656 |
9 | 193739769 |
10 | 5000050000 |
11 | 142656721086 |
12 | 4458051717120 |
13 | 151437584670385 |
14 | 5556003465485760 |
15 | 218946946471875000 |
16 | 9223372039002259456 |
17 | 413620131002462320337 |
18 | 19673204037747448432896 |
19 | 989209827833222327690890 |
[1,1,3,18,136,1625,23436,412972,8390656,193739769, 5000050000,142656721086,4458051717120, 151437584670385,5556003465485760, 218946946471875000,9223372039002259456, 413620131002462320337,19673204037747448432896, 989209827833222327690890] |