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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 36 |
| 9 | 127 |
| 10 | 337 |
| 11 | 793 |
| 12 | 7525 |
| 13 | 48764 |
| 14 | 238954 |
| 15 | 997790 |
| 16 | 6401435 |
| 17 | 49107697 |
| 18 | 345482807 |
| 19 | 2150694855 |
| 20 | 14656830110 |
| 21 | 116678887407 |
| 22 | 978172378669 |
| 23 | 7886661080873 |
| 24 | 63905475745765 |
| 25 | 553437891603452 |
| 26 | 5122279358273976 |
| 27 | 48331088541366296 |
| 28 | 458771027309344261 |