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 | 2 |
| 3 | 14 |
| 4 | 121 |
| 5 | 1383 |
| 6 | 19108 |
| 7 | 309708 |
| 8 | 5751027 |
| 9 | 120357325 |
| 10 | 2803145494 |
| 11 | 71926499002 |
| 12 | 2016492639229 |
| 13 | 61338391284387 |
| 14 | 2012321446421976 |
| 15 | 70833707268623448 |
| 16 | 2663117961930477847 |
| 17 | 106515148705020928105 |
| 18 | 4516063573152118802282 |
| 19 | 202328834841437929100838 |