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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 9 |
| 5 | 14 |
| 6 | 33 |
| 7 | 62 |
| 8 | 177 |
| 9 | 414 |
| 10 | 1155 |
| 11 | 1719 |
| 12 | 2625 |
| 13 | 4018 |
| 14 | 6849 |
| 15 | 9770 |
| 16 | 17675 |
| 17 | 30206 |
| 18 | 90609 |
| 19 | 260343 |
| 20 | 336006 |
| 21 | 757995 |
| 22 | 1290874 |
| 23 | 2029875 |
| 24 | 4059746 |
| 25 | 7037655 |
| 26 | 17594075 |
| 27 | 50850483 |
| 28 | 68589598 |
| 29 | 186888243 |
| 30 | 373659254 |
| 31 | 1884639669 |