n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 17 |
3 | 76 |
4 | 355 |
5 | 1724 |
6 | 8671 |
7 | 45028 |
8 | 240809 |
9 | 1323460 |
10 | 7461121 |
11 | 43079084 |
12 | 254388667 |
13 | 1534503676 |
14 | 9445067375 |
15 | 59263320964 |
16 | 378729294481 |
17 | 2463130313348 |
18 | 16290919259569 |
19 | 109500022678540 |
20 | 747527556645971 |
21 | 5180110680154684 |
22 | 36418521410184127 |
23 | 259636520604139556 |
[1,4,17,76,355,1724,8671,45028,240809,1323460, 7461121,43079084,254388667,1534503676,9445067375, 59263320964,378729294481,2463130313348, 16290919259569,109500022678540,747527556645971, 5180110680154684,36418521410184127, 259636520604139556] |