n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 15 |
6 | 72 |
7 | 420 |
8 | 2915 |
9 | 24570 |
10 | 245070 |
11 | 2633400 |
12 | 30588783 |
13 | 383841315 |
14 | 5197243590 |
15 | 75666140550 |
16 | 1177491151785 |
17 | 19496256883740 |
18 | 342184849138188 |
19 | 6346249258076280 |
20 | 124023565540658025 |
21 | 2547445128977720475 |
22 | 54865546632888272820 |
[1,0,0,0,1,15,72,420,2915,24570,245070,2633400, 30588783,383841315,5197243590,75666140550, 1177491151785,19496256883740,342184849138188, 6346249258076280,124023565540658025, 2547445128977720475,54865546632888272820] |