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 | 9 |
| 1 | 9 |
| 2 | 36 |
| 3 | 225 |
| 4 | 9 |
| 5 | 2304 |
| 6 | 1521 |
| 7 | 11025 |
| 8 | 49284 |
| 9 | 8649 |
| 10 | 576081 |
| 11 | 230400 |
| 12 | 3229209 |
| 13 | 10478169 |
| 14 | 4639716 |
| 15 | 140778225 |
| 16 | 29192409 |
| 17 | 911556864 |
| 18 | 2153052801 |
| 19 | 1951430625 |
| 20 | 33627490884 |
| 21 | 2586027609 |
| 22 | 249281516961 |
| 23 | 424895385600 |
| 24 | 715721076009 |
| 25 | 7848531119529 |