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 | 18 |
| 3 | 924 |
| 4 | 93320 |
| 5 | 15609240 |
| 6 | 3903974592 |
| 7 | 1364509038592 |
| 8 | 635177480713344 |
| 9 | 379867490829555840 |
| 10 | 283825251434680651520 |
| 11 | 259092157573229145859584 |
| 12 | 283735986144895532781391872 |
| 13 | 367138254141051794797009309696 |
| 14 | 554136240038549806366753446051840 |