n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 21 |
5 | 134 |
6 | 968 |
7 | 7662 |
8 | 65135 |
9 | 587040 |
10 | 5559342 |
11 | 54965230 |
12 | 564651110 |
13 | 6004908296 |
14 | 65920345700 |
15 | 745289233564 |
16 | 8661959227407 |
17 | 103330815828292 |
18 | 1263608418272768 |
19 | 15823268263301680 |
20 | 202712359166886406 |
21 | 2654710188935753950 |
22 | 35514167158635839770 |
[1,1,4,21,134,968,7662,65135,587040,5559342, 54965230,564651110,6004908296,65920345700, 745289233564,8661959227407,103330815828292, 1263608418272768,15823268263301680, 202712359166886406,2654710188935753950, 35514167158635839770] |