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 | 15 |
| 2 | 6423 |
| 3 | 4031952 |
| 4 | 2839677570 |
| 5 | 2111005408320 |
| 6 | 1624203259187196 |
| 7 | 1280171373413389056 |
| 8 | 1027235174396893007472 |
| 9 | 835745211680299639976976 |
| 10 | 687471000510964612782875472 |