n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 24 |
4 | 9216 |
5 | 772680 |
6 | 20864640 |
7 | 281690640 |
8 | 2408469504 |
9 | 14923820016 |
10 | 72840764160 |
11 | 295839890280 |
12 | 1038542714880 |
13 | 3238606068984 |
14 | 9155710252416 |
15 | 23832538897440 |
16 | 57817164625920 |
17 | 131989025850720 |
18 | 285757100158464 |
19 | 590483650831416 |
20 | 1170770734955520 |
[0,0,0,24,9216,772680,20864640,281690640, 2408469504,14923820016,72840764160,295839890280, 1038542714880,3238606068984,9155710252416, 23832538897440,57817164625920,131989025850720, 285757100158464,590483650831416,1170770734955520] |