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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 21 |
| 4 | 29 |
| 5 | 81 |
| 6 | 93 |
| 7 | 105 |
| 8 | 189 |
| 9 | 225 |
| 10 | 253 |
| 11 | 441 |
| 12 | 453 |
| 13 | 465 |
| 14 | 549 |
| 15 | 585 |
| 16 | 621 |
| 17 | 873 |
| 18 | 909 |
| 19 | 945 |
| 20 | 1197 |
| 21 | 1305 |
| 22 | 1397 |
| 23 | 2025 |
| 24 | 2037 |
| 25 | 2049 |
| 26 | 2133 |
| 27 | 2169 |
| 28 | 2205 |
| 29 | 2457 |
| 30 | 2493 |
| 31 | 2529 |
| 32 | 2781 |
| 33 | 2889 |
| 34 | 2997 |
| 35 | 3753 |
| 36 | 3789 |
| 37 | 3825 |
| 38 | 4077 |
| 39 | 4185 |
| 40 | 4293 |
| 41 | 5049 |
| 42 | 5157 |
| 43 | 5265 |
| 44 | 6021 |
| 45 | 6345 |
| 46 | 6637 |
| 47 | 8649 |