n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 20 |
7 | 210 |
8 | 1960 |
9 | 18900 |
10 | 194880 |
11 | 2166780 |
12 | 26172080 |
13 | 342599400 |
14 | 4835694864 |
15 | 73208215080 |
16 | 1183011385920 |
17 | 20318534134080 |
18 | 369549843420384 |
19 | 7094851788127680 |
20 | 143377043010268800 |
21 | 3042204544957939200 |
22 | 67621161484919380800 |
23 | 1571319471977711258880 |
[1,0,0,0,0,0,20,210,1960,18900,194880,2166780, 26172080,342599400,4835694864,73208215080, 1183011385920,20318534134080,369549843420384, 7094851788127680,143377043010268800, 3042204544957939200,67621161484919380800, 1571319471977711258880] |