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 | 7 |
| 2 | 12 |
| 3 | 21 |
| 4 | 36 |
| 5 | 63 |
| 6 | 108 |
| 7 | 189 |
| 8 | 324 |
| 9 | 567 |
| 10 | 972 |
| 11 | 1701 |
| 12 | 2916 |
| 13 | 5103 |
| 14 | 8748 |
| 15 | 15309 |
| 16 | 26244 |
| 17 | 45927 |
| 18 | 78732 |
| 19 | 137781 |
| 20 | 236196 |
| 21 | 413343 |
| 22 | 708588 |
| 23 | 1240029 |
| 24 | 2125764 |
| 25 | 3720087 |
| 26 | 6377292 |
| 27 | 11160261 |
| 28 | 19131876 |
| 29 | 33480783 |
| 30 | 57395628 |
| 31 | 100442349 |
| 32 | 172186884 |
| 33 | 301327047 |
| 34 | 516560652 |