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 | 1 |
| 3 | 4 |
| 4 | 14 |
| 5 | 47 |
| 6 | 178 |
| 7 | 697 |
| 8 | 2746 |
| 9 | 11071 |
| 10 | 45093 |
| 11 | 185341 |
| 12 | 767786 |
| 13 | 3201291 |
| 14 | 13420045 |
| 15 | 56524684 |