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 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 57 |
| 6 | 337 |
| 7 | 3737 |
| 8 | 72657 |
| 9 | 2369257 |
| 10 | 127188257 |
| 11 | 11156500857 |
| 12 | 1592432891857 |
| 13 | 369041278550057 |
| 14 | 138668563737942657 |
| 15 | 84415532990575319257 |
| 16 | 83213455958038482903857 |
| 17 | 132788829902694935512664457 |
| 18 | 342962001904259249964245209057 |