n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 22 |
5 | 168 |
6 | 1616 |
7 | 18800 |
8 | 256432 |
9 | 4012288 |
10 | 70825344 |
11 | 1392214272 |
12 | 30157260288 |
13 | 713680180224 |
14 | 18319344307200 |
15 | 506934586748928 |
16 | 15043324048398336 |
17 | 476540007615725568 |
18 | 16050059458251915264 |
19 | 572710950848334200832 |
20 | 21582629580640554123264 |
21 | 856552661738538476765184 |
[0,1,1,4,22,168,1616,18800,256432,4012288, 70825344,1392214272,30157260288,713680180224, 18319344307200,506934586748928,15043324048398336, 476540007615725568,16050059458251915264, 572710950848334200832,21582629580640554123264, 856552661738538476765184] |