n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 24 |
5 | 96 |
6 | 576 |
7 | 3312 |
8 | 26496 |
9 | 198144 |
10 | 1691136 |
11 | 14973696 |
12 | 193370112 |
13 | 2034809856 |
14 | 25087186944 |
15 | 313539434496 |
16 | 4421478721536 |
17 | 58307347556352 |
18 | 915011420737536 |
19 | 13553664911437824 |
20 | 240637745416421376 |
21 | 3965015057937924096 |
[1,1,2,6,24,96,576,3312,26496,198144,1691136, 14973696,193370112,2034809856,25087186944, 313539434496,4421478721536,58307347556352, 915011420737536,13553664911437824, 240637745416421376,3965015057937924096] |