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 | 6 |
| 4 | 12 |
| 5 | 26 |
| 6 | 53 |
| 7 | 110 |
| 8 | 231 |
| 9 | 483 |
| 10 | 1013 |
| 11 | 2125 |
| 12 | 4445 |
| 13 | 9307 |
| 14 | 19487 |
| 15 | 40802 |
| 16 | 85439 |
| 17 | 178910 |
| 18 | 374622 |
| 19 | 784426 |
| 20 | 1642522 |