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 | 12 |
| 4 | 38 |
| 5 | 200 |
| 6 | 701 |
| 7 | 3682 |
| 8 | 13294 |
| 9 | 70665 |
| 10 | 258430 |
| 11 | 1388002 |
| 12 | 5114572 |
| 13 | 27682135 |
| 14 | 102539204 |
| 15 | 558172494 |
| 16 | 2075658454 |
| 17 | 11348521989 |
| 18 | 42330184638 |