n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 0 |
5 | 24 |
6 | 40 |
7 | 720 |
8 | 2688 |
9 | 42560 |
10 | 245376 |
11 | 4072320 |
12 | 31672960 |
13 | 569935872 |
14 | 5576263680 |
15 | 109492807424 |
16 | 1290701905920 |
17 | 27616577064960 |
18 | 380852962029568 |
19 | 8845627365089280 |
20 | 139696582370328576 |
21 | 3506062524305162240 |
22 | 62387728088875499520 |
23 | 1684340707284076756992 |
[1,0,0,2,0,24,40,720,2688,42560,245376,4072320, 31672960,569935872,5576263680,109492807424, 1290701905920,27616577064960,380852962029568, 8845627365089280,139696582370328576, 3506062524305162240,62387728088875499520, 1684340707284076756992] |