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 | 1 |
| 3 | 3 |
| 4 | 18 |
| 5 | 190 |
| 6 | 3285 |
| 7 | 88851 |
| 8 | 3640644 |
| 9 | 220674924 |
| 10 | 19427552055 |
| 11 | 2448107338105 |
| 12 | 436330306419678 |
| 13 | 108909970814260122 |
| 14 | 37752710546082668409 |
| 15 | 18044326480066641231855 |
| 16 | 11818118910855384843861960 |
| 17 | 10549135258779933616014791704 |
| 18 | 12772521057179994145518171256587 |