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 | 3 |
| 3 | 24 |
| 4 | 328 |
| 5 | 6427 |
| 6 | 164765 |
| 7 | 5228210 |
| 8 | 197897582 |
| 9 | 8704544263 |
| 10 | 436312502297 |
| 11 | 24550259053858 |
| 12 | 1532241939881294 |
| 13 | 105048412352334420 |
| 14 | 7847739530288388636 |
| 15 | 634523723233529394594 |
| 16 | 55206024491463561241758 |
| 17 | 5142697402316326354705599 |
| 18 | 510704188733699181740089521 |
| 19 | 53858874208665420063477867788 |