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 | 1 |
| 4 | 4 |
| 5 | 6 |
| 6 | 19 |
| 7 | 43 |
| 8 | 120 |
| 9 | 307 |
| 10 | 866 |
| 11 | 2336 |
| 12 | 6588 |
| 13 | 18373 |
| 14 | 52119 |
| 15 | 147700 |
| 16 | 422016 |
| 17 | 1207477 |
| 18 | 3471067 |
| 19 | 9999135 |
| 20 | 28893560 |
| 21 | 83665729 |
| 22 | 242826187 |
| 23 | 706074369 |
| 24 | 2056870697 |
| 25 | 6001555275 |
| 26 | 17538335077 |
| 27 | 51323792789 |
| 28 | 150390053432 |
| 29 | 441210664337 |
| 30 | 1295886453860 |
| 31 | 3810208448847 |
| 32 | 11214076720061 |
| 33 | 33035788241735 |