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) |
|---|---|
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 36 |
| 7 | 81 |
| 8 | 174 |
| 9 | 413 |
| 10 | 889 |
| 11 | 1870 |
| 12 | 4031 |
| 13 | 8490 |
| 14 | 17580 |
| 15 | 36647 |
| 16 | 75801 |
| 17 | 154676 |
| 18 | 316873 |
| 19 | 646614 |
| 20 | 1309277 |
| 21 | 2653548 |
| 22 | 5358828 |
| 23 | 10786403 |
| 24 | 21697201 |
| 25 | 43539382 |
| 26 | 87208388 |
| 27 | 174392929 |
| 28 | 348359875 |
| 29 | 694913277 |
| 30 | 1384281163 |
| 31 | 2755398784 |
| 32 | 5476741024 |
| 33 | 10878139055 |
| 34 | 21590446589 |