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 | 4 |
| 2 | 25 |
| 3 | 200 |
| 4 | 2025 |
| 5 | 24300 |
| 6 | 342225 |
| 7 | 5475600 |
| 8 | 98903025 |
| 9 | 1978060500 |
| 10 | 43616234025 |
| 11 | 1046789616600 |
| 12 | 27260146265625 |
| 13 | 763284095437500 |
| 14 | 22925783009390625 |
| 15 | 733625056300500000 |
| 16 | 24966177697226390625 |
| 17 | 898782397100150062500 |
| 18 | 34178697267502928765625 |