n | a(n) |
---|---|
3 | 1 |
4 | 4 |
5 | 24 |
6 | 84 |
7 | 392 |
8 | 1344 |
9 | 5760 |
10 | 19800 |
11 | 81675 |
12 | 283140 |
13 | 1145144 |
14 | 4008004 |
15 | 16032016 |
16 | 56632576 |
17 | 225059328 |
18 | 801773856 |
19 | 3173688180 |
20 | 11392726800 |
21 | 44986664800 |
22 | 162594659920 |
23 | 641087516256 |
24 | 2331227331840 |
25 | 9183622822400 |
26 | 33577620944400 |
27 | 132211882468575 |
28 | 485773975404900 |
[1,4,24,84,392,1344,5760,19800,81675,283140, 1145144,4008004,16032016,56632576,225059328, 801773856,3173688180,11392726800,44986664800, 162594659920,641087516256,2331227331840, 9183622822400,33577620944400,132211882468575, 485773975404900] |