n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 12 |
5 | 30 |
6 | 639 |
7 | 1835 |
8 | 64601 |
9 | 369518 |
10 | 12351620 |
11 | 78569754 |
12 | 5477440592 |
13 | 35108337731 |
14 | 3031753084624 |
15 | 30230571143624 |
16 | 3308601182539217 |
17 | 33507627807222128 |
18 | 5183154493935250901 |
[0,1,1,2,12,30,639,1835,64601,369518,12351620, 78569754,5477440592,35108337731,3031753084624, 30230571143624,3308601182539217,33507627807222128, 5183154493935250901] |