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 | 6 |
| 2 | 21 |
| 3 | 57 |
| 4 | 133 |
| 5 | 281 |
| 6 | 554 |
| 7 | 1039 |
| 8 | 1878 |
| 9 | 3302 |
| 10 | 5686 |
| 11 | 9638 |
| 12 | 16143 |
| 13 | 26796 |
| 14 | 44179 |
| 15 | 72471 |
| 16 | 118435 |
| 17 | 193015 |
| 18 | 313920 |
| 19 | 509805 |
| 20 | 827036 |
| 21 | 1340636 |
| 22 | 2171996 |
| 23 | 3517532 |
| 24 | 5695053 |
| 25 | 9218786 |
| 26 | 14920769 |
| 27 | 24147269 |
| 28 | 39076593 |
| 29 | 63233317 |
| 30 | 102320326 |