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) |
|---|---|
| 2 | 90 |
| 3 | 875 |
| 4 | 2401 |
| 5 | 99671 |
| 6 | 999973 |
| 7 | 9991291 |
| 8 | 88529281 |
| 9 | 999997283 |
| 10 | 9999998329 |
| 11 | 99999997711 |
| 12 | 988053892081 |
| 13 | 9999999999809 |
| 14 | 99999999988979 |
| 15 | 999999999991541 |
| 16 | 9892436613211441 |
| 17 | 99999999999805729 |
| 18 | 999999999999968753 |
| 19 | 9999999999999834493 |
| 20 | 99964004859708406561 |
| 21 | 999999999999999959833 |