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 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 39 |
| 6 | 196 |
| 7 | 1175 |
| 8 | 8226 |
| 9 | 65807 |
| 10 | 592264 |
| 11 | 5922639 |
| 12 | 65149030 |
| 13 | 781788359 |
| 14 | 10163248668 |
| 15 | 142285481351 |
| 16 | 2134282220266 |
| 17 | 34148515524255 |
| 18 | 580524763912336 |
| 19 | 10449445750422047 |
| 20 | 198539469258018894 |