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 | 68 |
| 2 | 668 |
| 3 | 6668 |
| 4 | 67744 |
| 5 | 72352 |
| 6 | 666668 |
| 7 | 7143040 |
| 8 | 66666752 |
| 9 | 71430400 |
| 10 | 666666752 |
| 11 | 714304000 |
| 12 | 6666666668 |
| 13 | 7143040000 |
| 14 | 71430400000 |
| 15 | 666666666668 |
| 16 | 666666668032 |
| 17 | 714304000000 |
| 18 | 714499133440 |
| 19 | 7143040000000 |
| 20 | 7144991334400 |