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 | 3 |
| 1 | 0 |
| 2 | 1 |
| 3 | 225 |
| 4 | 1025 |
| 5 | 92025 |
| 6 | 1334025 |
| 7 | 5472225 |
| 8 | 35964225 |
| 9 | 930860225 |
| 10 | 1000837225 |
| 11 | 4979585600 |
| 12 | 38515961025 |
| 13 | 88154795025 |
| 14 | 2046945411225 |
| 15 | 88813460025 |
| 16 | 5684061441600 |
| 17 | 13052612865600 |
| 18 | 64745012358225 |