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 | 9 |
| 3 | 66 |
| 4 | 69 |
| 5 | 96 |
| 6 | 99 |
| 7 | 666 |
| 8 | 669 |
| 9 | 696 |
| 10 | 699 |
| 11 | 966 |
| 12 | 969 |
| 13 | 996 |
| 14 | 999 |
| 15 | 6666 |
| 16 | 6669 |
| 17 | 6696 |
| 18 | 6699 |
| 19 | 6966 |
| 20 | 6969 |
| 21 | 6996 |
| 22 | 6999 |
| 23 | 9666 |
| 24 | 9669 |
| 25 | 9696 |
| 26 | 9699 |
| 27 | 9966 |
| 28 | 9969 |
| 29 | 9996 |
| 30 | 9999 |
| 31 | 66666 |
| 32 | 66669 |
| 33 | 66696 |
| 34 | 66699 |
| 35 | 66966 |
| 36 | 66969 |
| 37 | 66996 |
| 38 | 66999 |
| 39 | 69666 |
| 40 | 69669 |
| 41 | 69696 |
| 42 | 69699 |
| 43 | 69966 |
| 44 | 69969 |