n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 56 |
5 | 270 |
6 | 4824 |
7 | 44520 |
8 | 866816 |
9 | 12195792 |
10 | 267873120 |
11 | 5073187680 |
12 | 126754229568 |
13 | 2999710359360 |
14 | 85061489235072 |
15 | 2400155295632640 |
16 | 76724104598031360 |
17 | 2502434971473937920 |
18 | 89428428468644493312 |
19 | 3300036525511418327040 |
[1,0,2,3,56,270,4824,44520,866816,12195792, 267873120,5073187680,126754229568,2999710359360, 85061489235072,2400155295632640,76724104598031360, 2502434971473937920,89428428468644493312, 3300036525511418327040] |