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 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 13 |
| 5 | 17 |
| 6 | 27 |
| 7 | 55 |
| 8 | 67 |
| 9 | 138 |
| 10 | 264 |
| 11 | 314 |
| 12 | 406 |
| 13 | 582 |
| 14 | 1046 |
| 15 | 1835 |
| 16 | 3609 |
| 17 | 16371 |
| 18 | 75611 |
| 19 | 118893 |
| 20 | 342363 |