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 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 16 |
| 5 | 52 |
| 6 | 93 |
| 7 | 303 |
| 8 | 542 |
| 9 | 1766 |
| 10 | 3159 |
| 11 | 10293 |
| 12 | 18412 |
| 13 | 59992 |
| 14 | 107313 |
| 15 | 349659 |
| 16 | 625466 |
| 17 | 2037962 |
| 18 | 3645483 |
| 19 | 11878113 |
| 20 | 21247432 |
| 21 | 69230716 |
| 22 | 123839109 |
| 23 | 403506183 |
| 24 | 721787222 |
| 25 | 2351806382 |
| 26 | 4206884223 |
| 27 | 13707332109 |
| 28 | 24519518116 |
| 29 | 79892186272 |