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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 30 |
| 4 | 3 |
| 5 | 235 |
| 6 | 5148 |
| 7 | 6 |
| 8 | 1448 |
| 9 | 96956 |
| 10 | 6014812 |
| 11 | 10 |
| 12 | 7909 |
| 13 | 1622015 |
| 14 | 329967798 |
| 15 | 57533191444 |
| 16 | 15 |
| 17 | 40674 |
| 18 | 25281625 |
| 19 | 16997993692 |
| 20 | 9454839968415 |
| 21 | 4956907379126694 |
| 22 | 21 |
| 23 | 202719 |
| 24 | 375341540 |
| 25 | 834776217484 |
| 26 | 1482823362091281 |
| 27 | 2480146959625512771 |
| 28 | 3954100866385811897908 |