n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 75 |
5 | 301 |
6 | 1204 |
7 | 4818 |
8 | 19275 |
9 | 77101 |
10 | 308404 |
11 | 1233618 |
12 | 4934475 |
13 | 19737901 |
14 | 78951604 |
15 | 315806418 |
16 | 1263225675 |
17 | 5052902701 |
18 | 20211610804 |
19 | 80846443218 |
20 | 323385772875 |
21 | 1293543091501 |
22 | 5174172366004 |
23 | 20696689464018 |
24 | 82786757856075 |
[1,4,18,75,301,1204,4818,19275,77101,308404, 1233618,4934475,19737901,78951604,315806418, 1263225675,5052902701,20211610804,80846443218, 323385772875,1293543091501,5174172366004, 20696689464018,82786757856075] |