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 | 25 |
| 4 | 239 |
| 5 | 3289 |
| 6 | 53111 |
| 7 | 1031497 |
| 8 | 22906903 |
| 9 | 578734697 |
| 10 | 16306214743 |
| 11 | 508360540457 |
| 12 | 17354157283287 |
| 13 | 644314385719593 |
| 14 | 25842490815894231 |
| 15 | 1113789927340848937 |
| 16 | 51332921853722842327 |
| 17 | 2519491205735072674601 |