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 | 6 |
| 3 | 51 |
| 4 | 568 |
| 5 | 7845 |
| 6 | 129456 |
| 7 | 2485567 |
| 8 | 54442368 |
| 9 | 1339822377 |
| 10 | 36602156800 |
| 11 | 1099126705611 |
| 12 | 35986038303744 |
| 13 | 1275815323139149 |
| 14 | 48693140873545728 |
| 15 | 1990581237014772375 |
| 16 | 86778247940387209216 |
| 17 | 4018626330009931930833 |
| 18 | 197009947951733259436032 |
| 19 | 10193206233792610863520867 |