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 | 5 |
| 3 | 48 |
| 4 | 239 |
| 5 | 1798 |
| 6 | 3950 |
| 7 | 19953 |
| 8 | 46007 |
| 9 | 123338 |
| 10 | 213793 |
| 11 | 637960 |
| 12 | 930635 |
| 13 | 2361080 |
| 14 | 3542822 |
| 15 | 5736344 |