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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 25 |
| 5 | 438 |
| 6 | 18388 |
| 7 | 1409674 |
| 8 | 206682994 |
| 9 | 58152537184 |
| 10 | 31715884061624 |
| 11 | 33827568738189576 |
| 12 | 71066571962396085656 |
| 13 | 295645506683051376527648 |
| 14 | 2444503529745123474354656720 |
| 15 | 40269655263141217619453414445968 |