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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 26 |
| 6 | 64 |
| 7 | 163 |
| 8 | 416 |
| 9 | 1067 |
| 10 | 2755 |
| 11 | 7147 |
| 12 | 18613 |
| 13 | 48638 |
| 14 | 127463 |
| 15 | 334864 |
| 16 | 881657 |
| 17 | 2325750 |
| 18 | 6145596 |
| 19 | 16263866 |
| 20 | 43099804 |
| 21 | 114356611 |
| 22 | 303761260 |
| 23 | 807692034 |
| 24 | 2149632061 |
| 25 | 5726042115 |
| 26 | 15264691107 |
| 27 | 40722913454 |
| 28 | 108713644516 |