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 | 1 |
| 3 | 128 |
| 4 | 16384 |
| 5 | 2105280 |
| 6 | 269475840 |
| 7 | 34494988288 |
| 8 | 4415358500864 |
| 9 | 565166154790272 |
| 10 | 72341267946323968 |
| 11 | 9259682331352899584 |
| 12 | 1185239338413171146752 |
| 13 | 151710635321300728430592 |
| 14 | 19418961321126493239115776 |
| 15 | 2485627049104751885136429056 |