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 | 1 |
| 3 | 9 |
| 4 | 9 |
| 5 | 49 |
| 6 | 81 |
| 7 | 281 |
| 8 | 601 |
| 9 | 1729 |
| 10 | 4129 |
| 11 | 11049 |
| 12 | 27561 |
| 13 | 71761 |
| 14 | 182001 |
| 15 | 469049 |
| 16 | 1197049 |
| 17 | 3073249 |
| 18 | 7861441 |
| 19 | 20154441 |
| 20 | 51600201 |
| 21 | 132217969 |
| 22 | 338618769 |
| 23 | 867490649 |
| 24 | 2221965721 |
| 25 | 5691928321 |
| 26 | 14579791201 |
| 27 | 37347504489 |
| 28 | 95666669289 |
| 29 | 245056687249 |
| 30 | 627723364401 |