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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 35 |
| 7 | 107 |
| 8 | 363 |
| 9 | 1248 |
| 10 | 4460 |
| 11 | 16094 |
| 12 | 58937 |
| 13 | 217117 |
| 14 | 805475 |
| 15 | 3001127 |
| 16 | 11230003 |
| 17 | 42161529 |
| 18 | 158781106 |
| 19 | 599563893 |
| 20 | 2269506062 |
| 21 | 8609442688 |
| 22 | 32725637373 |
| 23 | 124621833354 |
| 24 | 475368834568 |
| 25 | 1816103345752 |
| 26 | 6948228104703 |
| 27 | 26618671505989 |
| 28 | 102102788362303 |