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 | 4 |
| 1 | 4 |
| 2 | 13 |
| 3 | 22 |
| 4 | 45 |
| 5 | 82 |
| 6 | 152 |
| 7 | 274 |
| 8 | 491 |
| 9 | 870 |
| 10 | 1531 |
| 11 | 2676 |
| 12 | 4652 |
| 13 | 8048 |
| 14 | 13865 |
| 15 | 23798 |
| 16 | 40713 |
| 17 | 69446 |
| 18 | 118144 |
| 19 | 200510 |
| 20 | 339559 |
| 21 | 573894 |
| 22 | 968183 |
| 23 | 1630632 |
| 24 | 2742100 |
| 25 | 4604572 |
| 26 | 7721797 |
| 27 | 12933334 |
| 28 | 21637221 |
| 29 | 36159610 |
| 30 | 60367976 |
| 31 | 100687786 |