n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 69 |
4 | 392 |
5 | 2235 |
6 | 12804 |
7 | 73710 |
8 | 426192 |
9 | 2473704 |
10 | 14405800 |
11 | 84137130 |
12 | 492652824 |
13 | 2891110235 |
14 | 16999928820 |
15 | 100136858625 |
16 | 590778928800 |
17 | 3490370847876 |
18 | 20647839813048 |
19 | 122287764072938 |
20 | 725023671281520 |
21 | 4302720916638417 |
[0,2,12,69,392,2235,12804,73710,426192,2473704, 14405800,84137130,492652824,2891110235, 16999928820,100136858625,590778928800, 3490370847876,20647839813048,122287764072938, 725023671281520,4302720916638417] |