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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 22 |
| 5 | 46 |
| 6 | 102 |
| 7 | 206 |
| 8 | 427 |
| 9 | 841 |
| 10 | 1658 |
| 11 | 3173 |
| 12 | 6038 |
| 13 | 11251 |
| 14 | 20807 |
| 15 | 37907 |
| 16 | 68493 |
| 17 | 122338 |
| 18 | 216819 |
| 19 | 380637 |
| 20 | 663417 |
| 21 | 1147033 |
| 22 | 1969961 |
| 23 | 3359677 |
| 24 | 5694592 |
| 25 | 9592063 |
| 26 | 16065593 |
| 27 | 26756430 |
| 28 | 44328414 |