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 | 16 |
| 4 | 105 |
| 5 | 961 |
| 6 | 11137 |
| 7 | 160000 |
| 8 | 2738385 |
| 9 | 54479161 |
| 10 | 1234554321 |
| 11 | 31384248336 |
| 12 | 884241045961 |
| 13 | 27342890695849 |
| 14 | 920521266133785 |
| 15 | 33512287502995456 |
| 16 | 1311768467139281697 |
| 17 | 54933923639963082961 |
| 18 | 2450641333396432006369 |