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 | 1 |
| 2 | 19 |
| 3 | 343 |
| 4 | 11305 |
| 5 | 58349 |
| 6 | 3230255 |
| 7 | 15652637 |
| 8 | 1076842043 |
| 9 | 55727585675 |
| 10 | 827556357229 |
| 11 | 4462381098539 |
| 12 | 472784126720165 |
| 13 | 2370070888522337 |
| 14 | 36233114985867725 |
| 15 | 676572663482064349 |
| 16 | 76896411800028508843 |
| 17 | 428831636633480067995 |
| 18 | 60264676461386071468577 |