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 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 9 |
| 6 | 121 |
| 7 | 232 |
| 8 | 343 |
| 9 | 454 |
| 10 | 565 |
| 11 | 676 |
| 12 | 898 |
| 13 | 12321 |
| 14 | 23432 |
| 15 | 45654 |
| 16 | 56765 |
| 17 | 67876 |
| 18 | 78987 |
| 19 | 1234321 |
| 20 | 2345432 |
| 21 | 3456543 |
| 22 | 4567654 |
| 23 | 5678765 |
| 24 | 6789876 |
| 25 | 123454321 |
| 26 | 234565432 |
| 27 | 456787654 |
| 28 | 567898765 |
| 29 | 12345654321 |
| 30 | 23456765432 |
| 31 | 45678987654 |