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 | 3 |
| 5 | 8 |
| 6 | 19 |
| 7 | 43 |
| 8 | 94 |
| 9 | 206 |
| 10 | 439 |
| 11 | 946 |
| 12 | 1990 |
| 13 | 4204 |
| 14 | 8761 |
| 15 | 18233 |
| 16 | 37778 |
| 17 | 78151 |
| 18 | 160296 |
| 19 | 328670 |
| 20 | 670193 |
| 21 | 1363543 |
| 22 | 2772436 |
| 23 | 5632801 |
| 24 | 11404156 |
| 25 | 23071507 |
| 26 | 46613529 |
| 27 | 94098106 |
| 28 | 189959349 |
| 29 | 383407198 |
| 30 | 773009751 |