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 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 27 |
| 4 | 83 |
| 5 | 195 |
| 6 | 515 |
| 7 | 1155 |
| 8 | 2899 |
| 9 | 6387 |
| 10 | 15219 |
| 11 | 32883 |
| 12 | 76275 |
| 13 | 163059 |
| 14 | 368883 |
| 15 | 780531 |
| 16 | 1738259 |
| 17 | 3653715 |
| 18 | 8022355 |
| 19 | 16759635 |
| 20 | 36428371 |
| 21 | 75765843 |
| 22 | 163217491 |
| 23 | 338120787 |
| 24 | 723384915 |
| 25 | 1493913171 |
| 26 | 3176799827 |
| 27 | 6542573139 |
| 28 | 13844246099 |
| 29 | 28447592019 |
| 30 | 59934789203 |