n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 88 |
7 | 632 |
8 | 8816 |
9 | 217616 |
10 | 10240960 |
11 | 920250720 |
12 | 155094492288 |
13 | 48647483234624 |
14 | 28422244905194880 |
15 | 31028639315541654400 |
16 | 63535600643007773309952 |
17 | 244919299732387943680047360 |
18 | 1783414099102940635260044486144 |
[1,1,2,6,20,88,632,8816,217616,10240960,920250720, 155094492288,48647483234624,28422244905194880, 31028639315541654400,63535600643007773309952, 244919299732387943680047360, 1783414099102940635260044486144] |