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 | 10 |
| 3 | 30 |
| 4 | 78 |
| 5 | 189 |
| 6 | 440 |
| 7 | 999 |
| 8 | 2230 |
| 9 | 4917 |
| 10 | 10740 |
| 11 | 23283 |
| 12 | 50162 |
| 13 | 107505 |
| 14 | 229360 |
| 15 | 487407 |
| 16 | 1032174 |
| 17 | 2179053 |
| 18 | 4587500 |
| 19 | 9633771 |
| 20 | 20185066 |
| 21 | 42205161 |
| 22 | 88080360 |
| 23 | 183500775 |
| 24 | 381681638 |
| 25 | 792723429 |
| 26 | 1644167140 |
| 27 | 3405774819 |
| 28 | 7046430690 |
| 29 | 14562623457 |
| 30 | 30064771040 |