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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 16 |
| 7 | 36 |
| 8 | 75 |
| 9 | 164 |
| 10 | 401 |
| 11 | 1046 |
| 12 | 2718 |
| 13 | 6878 |
| 14 | 17200 |
| 15 | 43486 |
| 16 | 112202 |
| 17 | 293540 |
| 18 | 770535 |
| 19 | 2019891 |
| 20 | 5296670 |
| 21 | 13942944 |
| 22 | 36902130 |
| 23 | 98097968 |
| 24 | 261456388 |
| 25 | 697970447 |
| 26 | 1866383507 |
| 27 | 5001333169 |
| 28 | 13432923544 |
| 29 | 36154294520 |
| 30 | 97475330092 |
| 31 | 263188299372 |