n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 30 |
4 | 152 |
5 | 840 |
6 | 5232 |
7 | 37072 |
8 | 297600 |
9 | 2680704 |
10 | 26812160 |
11 | 294945024 |
12 | 3539364864 |
13 | 46011796480 |
14 | 644165265408 |
15 | 9662479226880 |
16 | 154599668154368 |
17 | 2628194359738368 |
18 | 47307498477649920 |
19 | 898842471080329216 |
[0,1,6,30,152,840,5232,37072,297600,2680704, 26812160,294945024,3539364864,46011796480, 644165265408,9662479226880,154599668154368, 2628194359738368,47307498477649920, 898842471080329216] |