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 | 189 |
| 3 | 3969 |
| 4 | 83349 |
| 5 | 1750329 |
| 6 | 36756909 |
| 7 | 771895089 |
| 8 | 16209796869 |
| 9 | 340405734249 |
| 10 | 7148520419229 |
| 11 | 150118928803809 |
| 12 | 3152497504879989 |
| 13 | 66202447602479769 |
| 14 | 1390251399652075149 |
| 15 | 29195279392693578129 |