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 | 421 |
| 3 | 422 |
| 4 | 423 |
| 5 | 424 |
| 6 | 425 |
| 7 | 426 |
| 8 | 432 |
| 9 | 433 |
| 10 | 1726 |
| 11 | 3888 |
| 12 | 3889 |
| 13 | 4309 |
| 14 | 4310 |
| 15 | 4311 |
| 16 | 4312 |
| 17 | 4313 |
| 18 | 4314 |
| 19 | 4320 |
| 20 | 4321 |
| 21 | 9330 |