n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 19 |
4 | 107 |
5 | 647 |
6 | 4167 |
7 | 27847 |
8 | 191747 |
9 | 1349743 |
10 | 9671316 |
11 | 70297105 |
12 | 517079157 |
13 | 3841701488 |
14 | 28787546360 |
15 | 217317367487 |
16 | 1651144126659 |
17 | 12616570941114 |
18 | 96891439504019 |
19 | 747452640586114 |
20 | 5789461514134881 |
[1,1,4,19,107,647,4167,27847,191747,1349743, 9671316,70297105,517079157,3841701488,28787546360, 217317367487,1651144126659,12616570941114, 96891439504019,747452640586114,5789461514134881] |