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 | 2 |
| 2 | 30 |
| 3 | 259 |
| 4 | 429 |
| 5 | 4612 |
| 6 | 26466 |
| 7 | 88110 |
| 8 | 31545 |
| 9 | 104071 |
| 10 | 2775456 |
| 11 | 14614604 |
| 12 | 15793779 |
| 13 | 164082567 |
| 14 | 476853784 |
| 15 | 495207013 |
| 16 | 3613011290 |
| 17 | 9032608100 |
| 18 | 69827848342 |