n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 12 |
5 | 20 |
6 | 72 |
7 | 168 |
8 | 528 |
9 | 1440 |
10 | 4480 |
11 | 13046 |
12 | 40008 |
13 | 120055 |
14 | 366324 |
15 | 1109745 |
16 | 3380752 |
17 | 10269819 |
18 | 31253904 |
19 | 95011267 |
20 | 288979680 |
21 | 878550498 |
22 | 2671223720 |
23 | 8120041693 |
24 | 24682865208 |
25 | 75020015675 |
26 | 227999634772 |
27 | 692872971246 |
28 | 2105464666676 |
[1,2,3,12,20,72,168,528,1440,4480,13046,40008, 120055,366324,1109745,3380752,10269819,31253904, 95011267,288979680,878550498,2671223720, 8120041693,24682865208,75020015675,227999634772, 692872971246,2105464666676] |