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) |
|---|---|
| 2 | 260311602096 |
| 3 | 1161970522902 |
| 4 | 3240922809120 |
| 5 | 16446205929150 |
| 6 | 5681121663231 |
| 7 | 86430674537922 |
| 8 | 36434748011040 |
| 9 | 2119208930874272 |
| 10 | 1198501397192925 |
| 11 | 850466252340408 |
| 12 | 567228097076960 |
| 13 | 80847888446187460 |
| 14 | 5733768413240616 |
| 15 | 12410554422030840 |
| 16 | 3028257303808673 |
| 17 | 32977836735154716 |
| 18 | 27000016202473335 |
| 19 | 239720296892530428 |
| 20 | 57796746638482600 |