n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 104 |
3 | 1760 |
4 | 39520 |
5 | 590720 |
6 | 14285056 |
7 | 205151232 |
8 | 4596467200 |
9 | 75375073280 |
10 | 1504196046848 |
11 | 23673049726976 |
12 | 525315968712704 |
13 | 7912159583600640 |
14 | 158055039529779200 |
15 | 2726833423421800448 |
16 | 51889395654107463680 |
17 | 840470097284214292480 |
18 | 16765991910040314839040 |
[1,4,104,1760,39520,590720,14285056,205151232, 4596467200,75375073280,1504196046848, 23673049726976,525315968712704,7912159583600640, 158055039529779200,2726833423421800448, 51889395654107463680,840470097284214292480, 16765991910040314839040] |