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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 18 |
| 3 | 289 |
| 4 | 4608 |
| 5 | 73441 |
| 6 | 1170450 |
| 7 | 18653761 |
| 8 | 297289728 |
| 9 | 4737981889 |
| 10 | 75510420498 |
| 11 | 1203428746081 |
| 12 | 19179349516800 |
| 13 | 305666163522721 |
| 14 | 4871479266846738 |
| 15 | 77638002106025089 |
| 16 | 1237336554429554688 |