n | a(n) |
---|---|
1 | 4 |
2 | 21 |
3 | 75 |
4 | 450 |
5 | 1729 |
6 | 7233 |
7 | 36148 |
8 | 139855 |
9 | 645733 |
10 | 2919837 |
11 | 11900426 |
12 | 55182313 |
13 | 238587617 |
14 | 1020077489 |
15 | 4627613220 |
16 | 19831142375 |
17 | 86874931360 |
18 | 386104242606 |
19 | 1664229710205 |
20 | 7344843690603 |
21 | 32253553194721 |
22 | 140150173949016 |
[4,21,75,450,1729,7233,36148,139855,645733, 2919837,11900426,55182313,238587617,1020077489, 4627613220,19831142375,86874931360,386104242606, 1664229710205,7344843690603,32253553194721, 140150173949016] |