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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 7 |
| 6 | 15 |
| 7 | 37 |
| 8 | 163 |
| 9 | 177 |
| 10 | 4503 |
| 11 | 4503 |
| 12 | 4503 |
| 13 | 4503 |
| 14 | 4503 |
| 15 | 833021343 |
| 16 | 12465115083 |
| 17 | 95854279610863 |
| 18 | 1158174141556287 |