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 | 3 |
| 4 | 3 |
| 5 | 9 |
| 6 | 15 |
| 7 | 63 |
| 8 | 63 |
| 9 | 189 |
| 10 | 315 |
| 11 | 1323 |
| 12 | 1701 |
| 13 | 6237 |
| 14 | 12285 |
| 15 | 59535 |
| 16 | 59535 |
| 17 | 178605 |
| 18 | 297675 |
| 19 | 1250235 |
| 20 | 1607445 |
| 21 | 5893965 |
| 22 | 11609325 |
| 23 | 56260575 |
| 24 | 63761985 |
| 25 | 213790185 |
| 26 | 393824025 |
| 27 | 1811590515 |
| 28 | 2531725875 |
| 29 | 10025634465 |
| 30 | 21210236775 |
| 31 | 109876902975 |
| 32 | 109876902975 |
| 33 | 329630708925 |