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 | 4 |
| 3 | 26 |
| 4 | 255 |
| 5 | 3125 |
| 6 | 46593 |
| 7 | 823415 |
| 8 | 16776960 |
| 9 | 387400807 |
| 10 | 9999941975 |
| 11 | 285311495511 |
| 12 | 8916083675135 |
| 13 | 302875039491581 |
| 14 | 11112006557122561 |
| 15 | 437893859877597389 |
| 16 | 18446743921164642176 |
| 17 | 827240261123526320144 |
| 18 | 39346407973736968327497 |