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 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 17 |
| 5 | 31 |
| 6 | 80 |
| 7 | 152 |
| 8 | 404 |
| 9 | 790 |
| 10 | 2140 |
| 11 | 4271 |
| 12 | 11729 |
| 13 | 23767 |
| 14 | 65952 |
| 15 | 135221 |
| 16 | 378321 |
| 17 | 782968 |
| 18 | 2205168 |
| 19 | 4598804 |
| 20 | 13023324 |
| 21 | 27332956 |
| 22 | 77761008 |