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 | 94 |
| 3 | 455 |
| 4 | 539 |
| 5 | 994 |
| 6 | 7665 |
| 7 | 9994 |
| 8 | 72721 |
| 9 | 99994 |
| 10 | 356429 |
| 11 | 643565 |
| 12 | 999994 |
| 13 | 9090910 |
| 14 | 9999994 |
| 15 | 35294118 |
| 16 | 64705876 |
| 17 | 99999994 |
| 18 | 335664329 |
| 19 | 664335665 |
| 20 | 684210520 |
| 21 | 818181819 |
| 22 | 838056674 |
| 23 | 846153847 |
| 24 | 866028702 |
| 25 | 980125139 |
| 26 | 999999994 |