n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 8 |
5 | 48 |
6 | 240 |
7 | 1968 |
8 | 13824 |
9 | 140160 |
10 | 1263360 |
11 | 15298560 |
12 | 168422400 |
13 | 2373073920 |
14 | 30865121280 |
15 | 496199854080 |
16 | 7445355724800 |
17 | 134510244986880 |
18 | 2287168006717440 |
19 | 45877376537395200 |
20 | 871804170613555200 |
21 | 19225435113632563200 |
22 | 403779880746418176000 |
[1,1,0,2,8,48,240,1968,13824,140160,1263360, 15298560,168422400,2373073920,30865121280, 496199854080,7445355724800,134510244986880, 2287168006717440,45877376537395200, 871804170613555200,19225435113632563200, 403779880746418176000] |