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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 15 |
| 3 | 29 |
| 4 | 597 |
| 5 | 4701 |
| 6 | 4643 |
| 7 | 413691 |
| 8 | 4512993 |
| 9 | 17926611 |
| 10 | 695000919 |
| 11 | 9680369943 |
| 12 | 4380611853 |
| 13 | 2303928046437 |
| 14 | 39031251610227 |
| 15 | 25940523189513 |
| 16 | 1206420504316107 |
| 17 | 20365306128628437 |
| 18 | 1849040492948486661 |