n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 12 |
4 | 24 |
5 | 80 |
6 | 2520 |
7 | 17136 |
8 | 124320 |
9 | 2462400 |
10 | 30965760 |
11 | 372113280 |
12 | 7014807360 |
13 | 122840789760 |
14 | 2078973921024 |
15 | 43236813312000 |
16 | 932206147891200 |
17 | 20090534745415680 |
18 | 480054835899371520 |
19 | 12126262777282805760 |
20 | 313198020852233932800 |
[1,0,0,12,24,80,2520,17136,124320,2462400, 30965760,372113280,7014807360,122840789760, 2078973921024,43236813312000,932206147891200, 20090534745415680,480054835899371520, 12126262777282805760,313198020852233932800] |