n | a(n) |
---|---|
10 | 1 |
11 | 20 |
12 | 349 |
13 | 5954 |
14 | 103194 |
15 | 1845480 |
16 | 34288800 |
17 | 663848640 |
18 | 13406178240 |
19 | 282398538240 |
20 | 6201593613645 |
21 | 141859542537845 |
22 | 3376683552323421 |
23 | 83546513273754977 |
24 | 2146303277645066980 |
25 | 57187254952684274700 |
26 | 1578640101972070456800 |
27 | 45101111852055549981600 |
[1,20,349,5954,103194,1845480,34288800,663848640, 13406178240,282398538240,6201593613645, 141859542537845,3376683552323421, 83546513273754977,2146303277645066980, 57187254952684274700,1578640101972070456800, 45101111852055549981600] |