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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 16 |
| 7 | 43 |
| 8 | 120 |
| 9 | 339 |
| 10 | 985 |
| 11 | 2892 |
| 12 | 8606 |
| 13 | 25850 |
| 14 | 78347 |
| 15 | 239161 |
| 16 | 734922 |
| 17 | 2271085 |
| 18 | 7054235 |
| 19 | 22010418 |
| 20 | 68958139 |
| 21 | 216842102 |
| 22 | 684164551 |
| 23 | 2165240365 |
| 24 | 6871792256 |
| 25 | 21865189969 |
| 26 | 69737972975 |
| 27 | 222915760126 |
| 28 | 714001019626 |
| 29 | 2291298553660 |
| 30 | 7366035776888 |