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 | 7 |
| 2 | 22 |
| 3 | 69 |
| 4 | 216 |
| 5 | 671 |
| 6 | 2066 |
| 7 | 6313 |
| 8 | 19180 |
| 9 | 58035 |
| 10 | 175110 |
| 11 | 527357 |
| 12 | 1586144 |
| 13 | 4766599 |
| 14 | 14316154 |
| 15 | 42981201 |
| 16 | 129009108 |
| 17 | 387158363 |
| 18 | 1161737198 |
| 19 | 3485735845 |
| 20 | 10458256072 |
| 21 | 31376865327 |
| 22 | 94134790242 |
| 23 | 282412759289 |
| 24 | 847255055036 |
| 25 | 2541798719491 |
| 26 | 7625463267286 |
| 27 | 22876524019533 |