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 | 1 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 3 |
| 8 | 1 |
| 9 | 7 |
| 10 | 4 |
| 11 | 19 |
| 12 | 17 |
| 13 | 63 |
| 14 | 77 |
| 15 | 217 |
| 16 | 326 |
| 17 | 815 |
| 18 | 1435 |
| 19 | 3533 |
| 20 | 7227 |
| 21 | 17709 |
| 22 | 39704 |
| 23 | 97010 |
| 24 | 228123 |
| 25 | 561216 |
| 26 | 1366962 |
| 27 | 3423504 |
| 28 | 8601350 |
| 29 | 22000341 |
| 30 | 56612480 |
| 31 | 147248370 |
| 32 | 384885631 |