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 | 9 |
| 2 | 225 |
| 3 | 7056 |
| 4 | 245025 |
| 5 | 9018009 |
| 6 | 344622096 |
| 7 | 13521038400 |
| 8 | 540917591841 |
| 9 | 21966328580625 |
| 10 | 902702926350225 |
| 11 | 37456461988358400 |
| 12 | 1566697064677290000 |
| 13 | 65973795093338597136 |
| 14 | 2794203818390077646400 |
| 15 | 118933541228935777741056 |
| 16 | 5084343623375056062840609 |