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 | 4 |
| 2 | 4 |
| 3 | 4 |
| 4 | 4 |
| 5 | 4 |
| 6 | 6 |
| 7 | 23 |
| 8 | 26 |
| 9 | 126 |
| 10 | 132 |
| 11 | 154 |
| 12 | 269 |
| 13 | 421 |
| 14 | 911 |
| 15 | 1899 |
| 16 | 7335 |
| 17 | 14245 |
| 18 | 34244 |
| 19 | 78354 |
| 20 | 173699 |
| 21 | 239896 |
| 22 | 247397 |
| 23 | 659900 |
| 24 | 1646344 |
| 25 | 2454988 |
| 26 | 6831657 |
| 27 | 65833355 |
| 28 | 839918922 |
| 29 | 1187969748 |
| 30 | 3583279448 |
| 31 | 4114383765 |
| 32 | 6590212761 |
| 33 | 11304687651 |