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 | 4 |
| 4 | 9 |
| 5 | 23 |
| 6 | 57 |
| 7 | 151 |
| 8 | 421 |
| 9 | 1202 |
| 10 | 3397 |
| 11 | 9498 |
| 12 | 25970 |
| 13 | 70005 |
| 14 | 187259 |
| 15 | 500061 |