n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 8 |
6 | 36 |
7 | 110 |
8 | 666 |
9 | 3250 |
10 | 23436 |
11 | 125198 |
12 | 1037520 |
13 | 7241272 |
14 | 66360960 |
15 | 500827928 |
16 | 5080370400 |
17 | 45926666984 |
18 | 508032504000 |
19 | 4919789029480 |
20 | 59256857923200 |
21 | 656763542278304 |
22 | 8532986822438400 |
23 | 100525959568386848 |
24 | 1405335514253932800 |
25 | 18431883489984091552 |
[1,1,1,1,3,8,36,110,666,3250,23436,125198,1037520, 7241272,66360960,500827928,5080370400,45926666984, 508032504000,4919789029480,59256857923200, 656763542278304,8532986822438400, 100525959568386848,1405335514253932800, 18431883489984091552] |