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 | 4 |
| 2 | 49 |
| 3 | 529 |
| 4 | 4489 |
| 5 | 38809 |
| 6 | 344569 |
| 7 | 363609 |
| 8 | 375769 |
| 9 | 444889 |
| 10 | 558009 |
| 11 | 597529 |
| 12 | 700569 |
| 13 | 7198489 |
| 14 | 35366809 |
| 15 | 44448889 |
| 16 | 65983129 |
| 17 | 4444488889 |
| 18 | 5587114009 |
| 19 | 83574762649 |
| 20 | 335330171929 |
| 21 | 359763638809 |
| 22 | 390241344249 |
| 23 | 403831017529 |
| 24 | 407200963129 |
| 25 | 435775577689 |
| 26 | 444444888889 |
| 27 | 453557800089 |