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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 11 |
| 7 | 26 |
| 8 | 56 |
| 9 | 121 |
| 10 | 255 |
| 11 | 539 |
| 12 | 1123 |
| 13 | 2332 |
| 14 | 4808 |
| 15 | 9891 |
| 16 | 20262 |
| 17 | 41413 |
| 18 | 84411 |
| 19 | 171760 |
| 20 | 348857 |
| 21 | 707593 |
| 22 | 1433315 |
| 23 | 2900313 |
| 24 | 5863023 |
| 25 | 11842460 |