n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 61 |
5 | 375 |
6 | 2697 |
7 | 22176 |
8 | 204977 |
9 | 2102445 |
10 | 23685615 |
11 | 290642220 |
12 | 3857751573 |
13 | 55063797243 |
14 | 840956549517 |
15 | 13682498891040 |
16 | 236257301424225 |
17 | 4314883836968505 |
18 | 83102361300891963 |
19 | 1683252077760375660 |
20 | 35770269996769203405 |
21 | 795749735451309432255 |
[1,1,3,12,61,375,2697,22176,204977,2102445, 23685615,290642220,3857751573,55063797243, 840956549517,13682498891040,236257301424225, 4314883836968505,83102361300891963, 1683252077760375660,35770269996769203405, 795749735451309432255] |