n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 380 |
3 | 7220 |
4 | 136990 |
5 | 2599200 |
6 | 49316400 |
7 | 935712000 |
8 | 17753871510 |
9 | 336855735180 |
10 | 6391382632020 |
11 | 121267853544780 |
12 | 2300893742387430 |
13 | 43656351283440360 |
14 | 828320305398630840 |
15 | 15716259104684097960 |
[1,20,380,7220,136990,2599200,49316400,935712000, 17753871510,336855735180,6391382632020, 121267853544780,2300893742387430, 43656351283440360,828320305398630840, 15716259104684097960] |