n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 3 |
5 | 12 |
6 | 60 |
7 | 360 |
8 | 2835 |
9 | 24696 |
10 | 237384 |
11 | 2503440 |
12 | 28941165 |
13 | 363593340 |
14 | 4930388892 |
15 | 71759200968 |
16 | 1115892704745 |
17 | 18465120087120 |
18 | 323965034820720 |
19 | 6007037150742624 |
20 | 117377605956803571 |
21 | 2410702829834021820 |
22 | 51917379915449131020 |
[1,0,0,0,3,12,60,360,2835,24696,237384,2503440, 28941165,363593340,4930388892,71759200968, 1115892704745,18465120087120,323965034820720, 6007037150742624,117377605956803571, 2410702829834021820,51917379915449131020] |