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 | 11025 |
| 5 | 99225 |
| 6 | 12006225 |
| 7 | 2029052025 |
| 8 | 405810405 |
| 9 | 117279207045 |
| 10 | 42337793743245 |
| 11 | 42337793743245 |
| 12 | 22396692890176605 |
| 13 | 2799586611272075625 |
| 14 | 25196279501448680625 |
| 15 | 21190071060718340405625 |