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 | 0 |
| 2 | 3 |
| 3 | 9 |
| 4 | 29 |
| 5 | 74 |
| 6 | 179 |
| 7 | 403 |
| 8 | 871 |
| 9 | 1816 |
| 10 | 3686 |
| 11 | 7316 |
| 12 | 14258 |
| 13 | 27362 |
| 14 | 51827 |
| 15 | 97067 |
| 16 | 180027 |
| 17 | 331038 |
| 18 | 604125 |
| 19 | 1095085 |
| 20 | 1973095 |
| 21 | 3535810 |
| 22 | 6305148 |
| 23 | 11193384 |
| 24 | 19790484 |
| 25 | 34860084 |
| 26 | 61193859 |
| 27 | 107080413 |
| 28 | 186826121 |
| 29 | 325073906 |
| 30 | 564190391 |