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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 9 |
| 5 | 14 |
| 6 | 52 |
| 7 | 149 |
| 8 | 213 |
| 9 | 673 |
| 10 | 1778 |
| 11 | 3653 |
| 12 | 6831 |
| 13 | 9868 |
| 14 | 570972 |
| 15 | 2835107 |
| 16 | 3613594 |
| 17 | 47211979 |
| 18 | 60418265 |
| 19 | 99909506 |
| 20 | 1701207282 |
| 21 | 4587170542 |
| 22 | 10955668024 |
| 23 | 29031152874 |
| 24 | 114018751785 |
| 25 | 813149731047 |