n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 14 |
4 | 88 |
5 | 670 |
6 | 6170 |
7 | 66360 |
8 | 815640 |
9 | 11272800 |
10 | 173132400 |
11 | 2925014400 |
12 | 53909394000 |
13 | 1076365290000 |
14 | 23144112591600 |
15 | 533193460800000 |
16 | 13102608591072000 |
17 | 342105146182800000 |
18 | 9457689380931792000 |
19 | 275988880808825184000 |
20 | 8477631163592791200000 |
21 | 273430368958004818560000 |
22 | 9238944655686318693120000 |
[1,1,3,14,88,670,6170,66360,815640,11272800, 173132400,2925014400,53909394000,1076365290000, 23144112591600,533193460800000,13102608591072000, 342105146182800000,9457689380931792000, 275988880808825184000,8477631163592791200000, 273430368958004818560000, 9238944655686318693120000] |