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 | 3 |
| 3 | 8 |
| 4 | 52 |
| 5 | 294 |
| 6 | 1691 |
| 7 | 9736 |
| 8 | 56277 |
| 9 | 326430 |
| 10 | 1899530 |
| 11 | 11085360 |
| 12 | 64857925 |
| 13 | 380331474 |
| 14 | 2234804775 |
| 15 | 13155328400 |
| 16 | 77565394650 |
| 17 | 458003596050 |
| 18 | 2707970743326 |
| 19 | 16030265384752 |
| 20 | 94997726453172 |