n | a(n) |
---|---|
4 | 1 |
5 | 10 |
6 | 60 |
7 | 280 |
8 | 1120 |
9 | 4032 |
10 | 13440 |
11 | 42240 |
12 | 126720 |
13 | 366080 |
14 | 1025024 |
15 | 2795520 |
16 | 7454720 |
17 | 19496960 |
18 | 50135040 |
19 | 127008768 |
20 | 317521920 |
21 | 784465920 |
22 | 1917583360 |
23 | 4642570240 |
24 | 11142168576 |
25 | 26528972800 |
26 | 62704844800 |
27 | 147220070400 |
[1,10,60,280,1120,4032,13440,42240,126720,366080, 1025024,2795520,7454720,19496960,50135040, 127008768,317521920,784465920,1917583360, 4642570240,11142168576,26528972800,62704844800, 147220070400] |