n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 18 |
4 | 204 |
5 | 2940 |
6 | 56670 |
7 | 1471806 |
8 | 52067512 |
9 | 2520298584 |
10 | 167850357210 |
11 | 15435027907530 |
12 | 1967345286257604 |
13 | 348527628228821652 |
14 | 86057693880611800438 |
15 | 29677160119074814383030 |
16 | 14321851348104417100842480 |
[0,0,2,18,204,2940,56670,1471806,52067512, 2520298584,167850357210,15435027907530, 1967345286257604,348527628228821652, 86057693880611800438,29677160119074814383030, 14321851348104417100842480] |