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 | 4 |
| 1 | 9 |
| 2 | 13 |
| 3 | 48 |
| 4 | 61 |
| 5 | 170 |
| 6 | 1421 |
| 7 | 3012 |
| 8 | 4433 |
| 9 | 16311 |
| 10 | 20744 |
| 11 | 57799 |
| 12 | 483136 |
| 13 | 1024071 |
| 14 | 1507207 |
| 15 | 5545692 |
| 16 | 7052899 |
| 17 | 19651490 |
| 18 | 164264819 |
| 19 | 348181128 |
| 20 | 512445947 |
| 21 | 1885518969 |
| 22 | 2397964916 |
| 23 | 6681448801 |
| 24 | 55849555324 |