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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 46 |
| 5 | 234 |
| 6 | 1124 |
| 7 | 5241 |
| 8 | 24050 |
| 9 | 109429 |
| 10 | 495884 |
| 11 | 2244060 |
| 12 | 10158768 |
| 13 | 46055322 |
| 14 | 209247370 |
| 15 | 953184750 |
| 16 | 4354605139 |
| 17 | 19954396521 |
| 18 | 91721631238 |
| 19 | 422908476612 |
| 20 | 1955876264342 |
| 21 | 9072401893299 |
| 22 | 42203220058991 |
| 23 | 196862017041783 |
| 24 | 920700735516741 |