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 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 13 |
| 5 | 19 |
| 6 | 21 |
| 7 | 55 |
| 8 | 261 |
| 9 | 3415 |
| 10 | 4185 |
| 11 | 7353 |
| 12 | 12213 |
| 13 | 44169 |
| 14 | 60975 |
| 15 | 61011 |
| 16 | 108049 |
| 17 | 182451 |
| 18 | 228271 |
| 19 | 481801 |
| 20 | 500899 |
| 21 | 505431 |
| 22 | 1015321 |
| 23 | 1061095 |