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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 18 |
| 7 | 47 |
| 8 | 123 |
| 9 | 338 |
| 10 | 935 |
| 11 | 2657 |
| 12 | 7616 |
| 13 | 22138 |
| 14 | 64886 |
| 15 | 191873 |
| 16 | 571169 |
| 17 | 1711189 |
| 18 | 5153883 |
| 19 | 15599094 |
| 20 | 47415931 |
| 21 | 144692886 |
| 22 | 443091572 |
| 23 | 1361233280 |
| 24 | 4194107380 |
| 25 | 12957209782 |
| 26 | 40128629400 |
| 27 | 124562327944 |
| 28 | 387467513732 |
| 29 | 1207633413980 |