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 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 30 |
| 5 | 67 |
| 6 | 146 |
| 7 | 322 |
| 8 | 705 |
| 9 | 1549 |
| 10 | 3396 |
| 11 | 7453 |
| 12 | 16346 |
| 13 | 35861 |
| 14 | 78659 |
| 15 | 172549 |
| 16 | 378487 |
| 17 | 830234 |
| 18 | 1821136 |
| 19 | 3994730 |
| 20 | 8762543 |
| 21 | 19220904 |
| 22 | 42161568 |
| 23 | 92482585 |
| 24 | 202863051 |
| 25 | 444985664 |
| 26 | 976088107 |
| 27 | 2141075804 |
| 28 | 4696507779 |