This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 47 |
| 4 | 490 |
| 5 | 6417 |
| 6 | 101178 |
| 7 | 1866139 |
| 8 | 39425322 |
| 9 | 938856053 |
| 10 | 24883226698 |
| 11 | 726510389607 |
| 12 | 23169961642698 |
| 13 | 801435579830329 |
| 14 | 29884247978965146 |
| 15 | 1195036047465095027 |
| 16 | 51016725208899539626 |
| 17 | 2315820594694418639325 |
| 18 | 111384453953719146198762 |