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 | 21 |
| 2 | 31 |
| 3 | 41 |
| 4 | 51 |
| 5 | 61 |
| 6 | 71 |
| 7 | 81 |
| 8 | 91 |
| 9 | 421 |
| 10 | 931 |
| 11 | 3311 |
| 12 | 5111 |
| 13 | 5511 |
| 14 | 7711 |
| 15 | 8421 |
| 16 | 9731 |
| 17 | 9911 |
| 18 | 311111 |
| 19 | 444111 |
| 20 | 711111 |
| 21 | 777111 |
| 22 | 993311 |
| 23 | 8811111 |
| 24 | 51111111 |
| 25 | 55551111 |
| 26 | 91111111 |
| 27 | 93333311 |
| 28 | 99311111 |
| 29 | 99991111 |
| 30 | 441111111 |
| 31 | 6666611111 |
| 32 | 7111111111 |
| 33 | 9333311111 |
| 34 | 411111111111 |
| 35 | 555111111111 |
| 36 | 771111111111 |
| 37 | 777777111111 |
| 38 | 911111111111 |