n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 6 |
3 | 9 |
4 | 132 |
5 | 630 |
6 | 6642 |
7 | 55440 |
8 | 608976 |
9 | 6790392 |
10 | 85413960 |
11 | 1145077560 |
12 | 16600386888 |
13 | 256806229680 |
14 | 4233767671728 |
15 | 74015194485960 |
16 | 1368023697469440 |
17 | 26649263762049600 |
18 | 545697922821501888 |
19 | 11717708270380421760 |
20 | 263276186128105633920 |
[1,0,6,9,132,630,6642,55440,608976,6790392, 85413960,1145077560,16600386888,256806229680, 4233767671728,74015194485960,1368023697469440, 26649263762049600,545697922821501888, 11717708270380421760,263276186128105633920] |