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 | 2 |
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 38 |
| 5 | 112 |
| 6 | 276 |
| 7 | 814 |
| 8 | 1998 |
| 9 | 5702 |
| 10 | 14226 |
| 11 | 39404 |
| 12 | 99908 |
| 13 | 270922 |
| 14 | 695106 |
| 15 | 1859134 |
| 16 | 4807518 |
| 17 | 12748472 |
| 18 | 33128916 |
| 19 | 87394454 |
| 20 | 227792678 |
| 21 | 599050102 |
| 22 | 1564242906 |
| 23 | 4106054164 |
| 24 | 10733283588 |
| 25 | 28143585362 |
| 26 | 73614464826 |
| 27 | 192899714414 |
| 28 | 504751433798 |
| 29 | 1322156172352 |