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 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 6 |
| 5 | 15 |
| 6 | 21 |
| 7 | 25 |
| 8 | 27 |
| 9 | 28 |
| 10 | 52 |
| 11 | 70 |
| 12 | 205 |
| 13 | 245 |
| 14 | 308 |
| 15 | 339 |
| 16 | 357 |
| 17 | 415 |
| 18 | 524 |
| 19 | 537 |
| 20 | 1455 |
| 21 | 1500 |