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 | 6 |
| 2 | 55 |
| 3 | 66 |
| 4 | 666 |
| 5 | 5050 |
| 6 | 5565 |
| 7 | 6555 |
| 8 | 66066 |
| 9 | 500500 |
| 10 | 600060 |
| 11 | 605550 |
| 12 | 5656566 |
| 13 | 50005000 |
| 14 | 60505500 |
| 15 | 5000050000 |
| 16 | 6050055000 |
| 17 | 500000500000 |
| 18 | 605000550000 |
| 19 | 50000005000000 |
| 20 | 60500005500000 |
| 21 | 66605656050060 |
| 22 | 550006056055665 |
| 23 | 555665666566566 |
| 24 | 5000000050000000 |