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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 49 |
| 6 | 174 |
| 7 | 715 |
| 8 | 3115 |
| 9 | 14937 |
| 10 | 80435 |
| 11 | 447840 |
| 12 | 2724104 |
| 13 | 17442772 |
| 14 | 114379900 |
| 15 | 784149082 |
| 16 | 5708691486 |
| 17 | 43849291331 |
| 18 | 342473913400 |
| 19 | 2803269796342 |
| 20 | 23620771158595 |
| 21 | 201815957246322 |
| 22 | 1793779464521956 |
| 23 | 16342108667160302 |
| 24 | 154171144824008980 |
| 25 | 1518409682511777987 |