n | a(n) |
---|---|
1 | 1 |
2 | 21 |
3 | 156 |
4 | 1236 |
5 | 9552 |
6 | 74568 |
7 | 579792 |
8 | 4515312 |
9 | 35141952 |
10 | 273573984 |
11 | 2129509056 |
12 | 16576843584 |
13 | 129037857024 |
14 | 1004466036864 |
15 | 7819018652928 |
16 | 60865289156352 |
17 | 473791157511168 |
18 | 3688113552987648 |
19 | 28709232900123648 |
20 | 223480124314162176 |
[1,21,156,1236,9552,74568,579792,4515312,35141952, 273573984,2129509056,16576843584,129037857024, 1004466036864,7819018652928,60865289156352, 473791157511168,3688113552987648, 28709232900123648,223480124314162176] |