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 | 5 |
| 4 | 10 |
| 5 | 21 |
| 6 | 40 |
| 7 | 83 |
| 8 | 161 |
| 9 | 331 |
| 10 | 644 |
| 11 | 1102 |
| 12 | 3627 |
| 13 | 5646 |
| 14 | 10083 |
| 15 | 29188 |
| 16 | 53681 |
| 17 | 84121 |
| 18 | 237453 |
| 19 | 373114 |
| 20 | 1400757 |
| 21 | 2443494 |