n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 8 |
5 | 24 |
6 | 144 |
7 | 720 |
8 | 8448 |
9 | 64512 |
10 | 576000 |
11 | 5529600 |
12 | 74972160 |
13 | 887546880 |
14 | 11285084160 |
15 | 168318259200 |
16 | 2843121254400 |
17 | 44790578380800 |
18 | 747955947110400 |
19 | 13937735643955200 |
20 | 287117441217331200 |
21 | 5838778006909747200 |
22 | 120976472421826560000 |
23 | 2712639152754878054400 |
[1,1,0,2,8,24,144,720,8448,64512,576000,5529600, 74972160,887546880,11285084160,168318259200, 2843121254400,44790578380800,747955947110400, 13937735643955200,287117441217331200, 5838778006909747200,120976472421826560000, 2712639152754878054400] |