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) |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 19 |
| 3 | 40 |
| 4 | 80 |
| 5 | 154 |
| 6 | 289 |
| 7 | 532 |
| 8 | 965 |
| 9 | 1730 |
| 10 | 3072 |
| 11 | 5412 |
| 12 | 9471 |
| 13 | 16480 |
| 14 | 28535 |
| 15 | 49196 |
| 16 | 84496 |
| 17 | 144638 |
| 18 | 246845 |
| 19 | 420140 |
| 20 | 713353 |
| 21 | 1208518 |
| 22 | 2043264 |
| 23 | 3448200 |
| 24 | 5809275 |
| 25 | 9771704 |
| 26 | 16413019 |
| 27 | 27530992 |
| 28 | 46122320 |