n | a(n) |
---|---|
3 | 1 |
4 | 8 |
5 | 45 |
6 | 220 |
7 | 1001 |
8 | 4368 |
9 | 18564 |
10 | 77520 |
11 | 319770 |
12 | 1307504 |
13 | 5311735 |
14 | 21474180 |
15 | 86493225 |
16 | 347373600 |
17 | 1391975640 |
18 | 5567902560 |
19 | 22239974430 |
20 | 88732378800 |
21 | 353697121050 |
22 | 1408831480056 |
23 | 5608233007146 |
24 | 22314239266528 |
25 | 88749815264600 |
26 | 352870329957600 |
27 | 1402659561581460 |
[1,8,45,220,1001,4368,18564,77520,319770,1307504, 5311735,21474180,86493225,347373600,1391975640, 5567902560,22239974430,88732378800,353697121050, 1408831480056,5608233007146,22314239266528, 88749815264600,352870329957600,1402659561581460] |