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 | 7 |
| 3 | 94 |
| 4 | 856 |
| 5 | 2995 |
| 6 | 56902 |
| 7 | 413893 |
| 8 | 1527982 |
| 9 | 47859601 |
| 10 | 702710533 |
| 11 | 1373798194 |
| 12 | 8537856169 |
| 13 | 38139946795 |
| 14 | 565726979662 |
| 15 | 4367588800693 |
| 16 | 15840612137503 |
| 17 | 125269482488011 |
| 18 | 770614773688678 |
| 19 | 6470285143034935 |
| 20 | 54544210069919254 |