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 | 3 |
| 2 | 6 |
| 3 | 33 |
| 4 | 36 |
| 5 | 63 |
| 6 | 66 |
| 7 | 333 |
| 8 | 336 |
| 9 | 363 |
| 10 | 366 |
| 11 | 633 |
| 12 | 636 |
| 13 | 663 |
| 14 | 666 |
| 15 | 3333 |
| 16 | 3336 |
| 17 | 3363 |
| 18 | 3366 |
| 19 | 3633 |
| 20 | 3636 |
| 21 | 3663 |
| 22 | 3666 |
| 23 | 6333 |
| 24 | 6336 |
| 25 | 6363 |
| 26 | 6366 |
| 27 | 6633 |
| 28 | 6636 |
| 29 | 6663 |
| 30 | 6666 |
| 31 | 33333 |
| 32 | 33336 |
| 33 | 33363 |
| 34 | 33366 |
| 35 | 33633 |
| 36 | 33636 |
| 37 | 33663 |
| 38 | 33666 |
| 39 | 36333 |
| 40 | 36336 |
| 41 | 36363 |
| 42 | 36366 |
| 43 | 36633 |
| 44 | 36636 |