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 | 5 |
| 3 | 9 |
| 4 | 11 |
| 5 | 17 |
| 6 | 21 |
| 7 | 33 |
| 8 | 125 |
| 9 | 141 |
| 10 | 243 |
| 11 | 251 |
| 12 | 285 |
| 13 | 321 |
| 14 | 537 |
| 15 | 563 |
| 16 | 699 |
| 17 | 729 |
| 18 | 2841 |
| 19 | 3365 |
| 20 | 8451 |
| 21 | 8577 |
| 22 | 9699 |
| 23 | 9725 |
| 24 | 21011 |
| 25 | 22689 |
| 26 | 33921 |
| 27 | 51761 |
| 28 | 655845 |
| 29 | 676761 |
| 30 | 3480081 |