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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 4 |
| 7 | 6 |
| 8 | 16 |
| 9 | 25 |
| 10 | 46 |
| 11 | 120 |
| 12 | 211 |
| 13 | 441 |
| 14 | 1156 |
| 15 | 2233 |
| 16 | 5104 |
| 17 | 13581 |
| 18 | 28351 |
| 19 | 69345 |
| 20 | 188101 |
| 21 | 419320 |
| 22 | 1082566 |
| 23 | 2998776 |
| 24 | 7074211 |
| 25 | 19099158 |
| 26 | 54057004 |
| 27 | 133993951 |
| 28 | 375814531 |