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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 25 |
| 6 | 83 |
| 7 | 299 |
| 8 | 1158 |
| 9 | 4813 |
| 10 | 21373 |
| 11 | 100955 |
| 12 | 504916 |
| 13 | 2662761 |
| 14 | 14754311 |
| 15 | 85643459 |
| 16 | 519493938 |
| 17 | 3285790317 |
| 18 | 21628225041 |
| 19 | 147887079907 |
| 20 | 1048634836288 |
| 21 | 7698589399833 |
| 22 | 58432476430139 |
| 23 | 457901993065915 |
| 24 | 3700291495531166 |