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 | 196 |
| 4 | 1681 |
| 5 | 14884 |
| 6 | 133225 |
| 7 | 1196836 |
| 8 | 10764961 |
| 9 | 96864964 |
| 10 | 871725625 |
| 11 | 7845353476 |
| 12 | 70607649841 |
| 13 | 635467254244 |
| 14 | 5719200505225 |
| 15 | 51472790198116 |
| 16 | 463255068736321 |
| 17 | 4169295489486724 |
| 18 | 37523659017960025 |
| 19 | 337712929999378756 |
| 20 | 3039416366507624401 |