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 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 144 |
| 6 | 100 |
| 7 | 3600 |
| 8 | 11025 |
| 9 | 78400 |
| 10 | 63504 |
| 11 | 6350400 |
| 12 | 5336100 |
| 13 | 768398400 |
| 14 | 662547600 |
| 15 | 577152576 |
| 16 | 2029052025 |
| 17 | 519437318400 |
| 18 | 463325262400 |
| 19 | 150117385017600 |
| 20 | 135480939978384 |
| 21 | 122885206329600 |
| 22 | 111967718990400 |
| 23 | 54192375991353600 |
| 24 | 49770428644836900 |