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 | 121 |
| 2 | 121 |
| 3 | 3249 |
| 4 | 3249 |
| 5 | 1418481 |
| 6 | 1418481 |
| 7 | 61009 |
| 8 | 18429849 |
| 9 | 243953161 |
| 10 | 243953161 |
| 11 | 18429849 |
| 12 | 61009 |
| 13 | 1026169 |
| 14 | 1026169 |
| 15 | 23298053769 |
| 16 | 23298053769 |
| 17 | 16670889 |
| 18 | 228743149441 |
| 19 | 103788925659225 |
| 20 | 103788925659225 |
| 21 | 228743149441 |