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 | 3 |
| 3 | 9 |
| 4 | 13 |
| 5 | 31 |
| 6 | 43 |
| 7 | 81 |
| 8 | 121 |
| 9 | 235 |
| 10 | 1135 |
| 11 | 1245 |
| 12 | 1521 |
| 13 | 2019 |
| 14 | 2329 |
| 15 | 3573 |
| 16 | 11245 |
| 17 | 15571 |
| 18 | 37333 |
| 19 | 54471 |
| 20 | 70641 |