n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 18 |
5 | 30 |
6 | 510 |
7 | 1470 |
8 | 22890 |
9 | 284550 |
10 | 3171630 |
11 | 18486930 |
12 | 45347610 |
13 | 4254260010 |
14 | 2349577230 |
15 | 371965003410 |
16 | 9252750236730 |
17 | 190224835871070 |
18 | 221717289063270 |
19 | 14855058367239090 |
20 | 1662934646118135390 |
21 | 45974266913148043470 |
22 | 4510191947325194130 |
[0,0,0,0,18,30,510,1470,22890,284550,3171630, 18486930,45347610,4254260010,2349577230, 371965003410,9252750236730,190224835871070, 221717289063270,14855058367239090, 1662934646118135390,45974266913148043470, 4510191947325194130] |