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 | 12 |
| 2 | 144 |
| 3 | 1112 |
| 4 | 8024 |
| 5 | 53024 |
| 6 | 339927 |
| 7 | 2125134 |
| 8 | 13128024 |
| 9 | 80418708 |
| 10 | 490332106 |
| 11 | 2980442190 |
| 12 | 18082824827 |
| 13 | 109579150934 |
| 14 | 663532220578 |
| 15 | 4015904399274 |
| 16 | 24297890544570 |
| 17 | 146982319288138 |
| 18 | 889004822816985 |
| 19 | 5376572830392848 |