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 | 7 |
| 4 | 73 |
| 5 | 1051 |
| 6 | 19381 |
| 7 | 436087 |
| 8 | 11585953 |
| 9 | 354981571 |
| 10 | 12322179901 |
| 11 | 477938035807 |
| 12 | 20485584143113 |
| 13 | 961567521142411 |
| 14 | 49054912287659461 |
| 15 | 2702571588828034567 |
| 16 | 159911968233095867953 |
| 17 | 10114120854154243738771 |
| 18 | 680943323845807848142861 |