n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 3 |
6 | 9 |
7 | 20 |
8 | 63 |
9 | 272 |
10 | 1557 |
11 | 10412 |
12 | 77761 |
13 | 729051 |
14 | 8641753 |
15 | 126757272 |
16 | 2289847876 |
17 | 50015283552 |
18 | 1327280079169 |
19 | 43398915228962 |
20 | 1753679030593542 |
21 | 87293853894564783 |
22 | 5311141506545315135 |
23 | 394710940436034575590 |
[1,1,1,1,3,9,20,63,272,1557,10412,77761,729051, 8641753,126757272,2289847876,50015283552, 1327280079169,43398915228962,1753679030593542, 87293853894564783,5311141506545315135, 394710940436034575590] |