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 | 9 |
| 3 | 225 |
| 4 | 441 |
| 5 | 1521 |
| 6 | 2025 |
| 7 | 2601 |
| 8 | 12321 |
| 9 | 40401 |
| 10 | 62001 |
| 11 | 99225 |
| 12 | 103041 |
| 13 | 251001 |
| 14 | 321489 |
| 15 | 585225 |
| 16 | 893025 |
| 17 | 1022121 |
| 18 | 1108809 |
| 19 | 1212201 |
| 20 | 1320201 |
| 21 | 1946025 |
| 22 | 2368521 |
| 23 | 2480625 |
| 24 | 2772225 |
| 25 | 3101121 |
| 26 | 3744225 |
| 27 | 4473225 |
| 28 | 4862025 |
| 29 | 5517801 |
| 30 | 6125625 |