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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 37 |
| 7 | 95 |
| 8 | 285 |
| 9 | 876 |
| 10 | 2862 |
| 11 | 9582 |
| 12 | 33022 |
| 13 | 115454 |
| 14 | 409721 |
| 15 | 1467781 |
| 16 | 5305211 |
| 17 | 19302774 |
| 18 | 70662612 |
| 19 | 259980148 |
| 20 | 960908596 |