n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 18 |
4 | 112 |
5 | 600 |
6 | 2976 |
7 | 14112 |
8 | 65024 |
9 | 293760 |
10 | 1308160 |
11 | 5761536 |
12 | 25153536 |
13 | 109025280 |
14 | 469704704 |
15 | 2013143040 |
16 | 8589672448 |
17 | 36506664960 |
18 | 154617643008 |
19 | 652832538624 |
20 | 2748773826560 |
21 | 11544861081600 |
22 | 48378488553472 |
23 | 202310091276288 |
24 | 844424829468672 |
25 | 3518436999168000 |
[0,0,2,18,112,600,2976,14112,65024,293760,1308160, 5761536,25153536,109025280,469704704,2013143040, 8589672448,36506664960,154617643008,652832538624, 2748773826560,11544861081600,48378488553472, 202310091276288,844424829468672,3518436999168000] |