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 | 9 |
| 3 | 49 |
| 4 | 64 |
| 5 | 44944 |
| 6 | 69696 |
| 7 | 4999696 |
| 8 | 9696996 |
| 9 | 9966649 |
| 10 | 999444996 |
| 11 | 4649466969 |
| 12 | 64944444964 |
| 13 | 6469646694964996 |
| 14 | 69446644696999969 |
| 15 | 9446966946446994496 |
| 16 | 44499464666496696649 |
| 17 | 446646664496496964644 |
| 18 | 466994666666446696996 |
| 19 | 9469699669494449499664 |
| 20 | 494494499966694999949669969 |