n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 42 |
3 | 390 |
4 | 2940 |
5 | 19530 |
6 | 119196 |
7 | 684684 |
8 | 3758040 |
9 | 19909890 |
10 | 102539580 |
11 | 516023508 |
12 | 2547314952 |
13 | 12371513700 |
14 | 59252218200 |
15 | 280374917400 |
16 | 1312759571760 |
17 | 6089545431090 |
18 | 28014942671100 |
19 | 127932182324100 |
[0,3,42,390,2940,19530,119196,684684,3758040, 19909890,102539580,516023508,2547314952, 12371513700,59252218200,280374917400, 1312759571760,6089545431090,28014942671100, 127932182324100] |