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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 45 |
| 8 | 103 |
| 9 | 250 |
| 10 | 611 |
| 11 | 1528 |
| 12 | 3853 |
| 13 | 9875 |
| 14 | 25481 |
| 15 | 66382 |
| 16 | 174085 |
| 17 | 459541 |
| 18 | 1219462 |