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 | 11 |
| 6 | 23 |
| 7 | 80 |
| 8 | 230 |
| 9 | 837 |
| 10 | 2935 |
| 11 | 11251 |
| 12 | 43364 |
| 13 | 173205 |
| 14 | 699160 |
| 15 | 2868527 |
| 16 | 11872515 |
| 17 | 49583430 |
| 18 | 208407805 |
| 19 | 881085265 |