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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 12 |
| 6 | 31 |
| 7 | 74 |
| 8 | 168 |
| 9 | 369 |
| 10 | 792 |
| 11 | 1672 |
| 12 | 3487 |
| 13 | 7206 |
| 14 | 14788 |
| 15 | 30185 |
| 16 | 61356 |
| 17 | 124308 |
| 18 | 251199 |
| 19 | 506578 |
| 20 | 1019920 |
| 21 | 2050785 |
| 22 | 4119280 |
| 23 | 8267216 |
| 24 | 16580799 |
| 25 | 33236622 |
| 26 | 66594636 |
| 27 | 133385689 |
| 28 | 267089188 |
| 29 | 534692604 |
| 30 | 1070217247 |
| 31 | 2141780762 |
| 32 | 4285739832 |
| 33 | 8575004241 |