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 | 8 |
| 3 | 60 |
| 4 | 400 |
| 5 | 2500 |
| 6 | 15000 |
| 7 | 87500 |
| 8 | 500000 |
| 9 | 2812500 |
| 10 | 15625000 |
| 11 | 85937500 |
| 12 | 468750000 |
| 13 | 2539062500 |
| 14 | 13671875000 |
| 15 | 73242187500 |
| 16 | 390625000000 |
| 17 | 2075195312500 |
| 18 | 10986328125000 |
| 19 | 57983398437500 |
| 20 | 305175781250000 |
| 21 | 1602172851562500 |