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 | 0 |
| 1 | 1 |
| 2 | 27 |
| 3 | 703 |
| 4 | 18279 |
| 5 | 475255 |
| 6 | 12356631 |
| 7 | 321272407 |
| 8 | 8353082583 |
| 9 | 217180147159 |
| 10 | 5646683826135 |
| 11 | 146813779479511 |
| 12 | 3817158266467287 |
| 13 | 99246114928149463 |
| 14 | 2580398988131886039 |
| 15 | 67090373691429037015 |
| 16 | 1744349715977154962391 |
| 17 | 45353092615406029022167 |
| 18 | 1179180408000556754576343 |