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 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 21 |
| 6 | 129 |
| 7 | 5663 |
| 8 | 40087 |
| 9 | 184971 |
| 10 | 246901 |
| 11 | 251737 |
| 12 | 1610143 |
| 13 | 3098384123 |
| 14 | 19819945093 |
| 15 | 21323898091 |
| 16 | 123112069843 |
| 17 | 130057547087 |