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 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 22 |
| 5 | 33 |
| 6 | 55 |
| 7 | 111 |
| 8 | 121 |
| 9 | 141 |
| 10 | 202 |
| 11 | 303 |
| 12 | 323 |
| 13 | 505 |
| 14 | 515 |
| 15 | 535 |
| 16 | 545 |
| 17 | 626 |
| 18 | 707 |
| 19 | 717 |
| 20 | 737 |
| 21 | 939 |
| 22 | 949 |
| 23 | 959 |
| 24 | 1111 |
| 25 | 1441 |