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 | 4 |
| 2 | 9 |
| 3 | 43 |
| 4 | 204 |
| 5 | 1499 |
| 6 | 9538 |
| 7 | 71142 |
| 8 | 535578 |
| 9 | 4197196 |
| 10 | 33619380 |
| 11 | 274932272 |
| 12 | 2294771254 |
| 13 | 19489886063 |
| 14 | 167630912672 |
| 15 | 1456476399463 |