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 | 7 |
| 6 | 13 |
| 7 | 27 |
| 8 | 55 |
| 9 | 125 |
| 10 | 278 |
| 11 | 650 |
| 12 | 1510 |
| 13 | 3624 |
| 14 | 8655 |
| 15 | 21017 |
| 16 | 51212 |
| 17 | 125857 |
| 18 | 310581 |
| 19 | 770767 |
| 20 | 1920226 |