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 | 4 |
| 2 | 46 |
| 3 | 626 |
| 4 | 9094 |
| 5 | 136792 |
| 6 | 2102728 |
| 7 | 32804760 |
| 8 | 517325270 |
| 9 | 8225083124 |
| 10 | 131614959262 |
| 11 | 2116988791018 |
| 12 | 34196629924584 |
| 13 | 554369366584256 |
| 14 | 9014333613083632 |
| 15 | 146961155561594176 |
| 16 | 2401364353568376054 |
| 17 | 39316907672544234028 |
| 18 | 644861670750937767370 |