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 | 64 |
| 3 | 46656 |
| 4 | 56644 |
| 5 | 66564 |
| 6 | 544644 |
| 7 | 45454564 |
| 8 | 645566464 |
| 9 | 6465446464 |
| 10 | 5654446456464 |
| 11 | 6444655544646544 |
| 12 | 445646655445456656 |
| 13 | 45645446454646566544 |
| 14 | 46556646565455444544 |
| 15 | 566545664646454546564 |
| 16 | 6666455655446656664464 |
| 17 | 4566565465446655646456464 |
| 18 | 6464465564656456445556646564 |