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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 64 |
| 5 | 5 |
| 6 | 1512 |
| 7 | 7 |
| 8 | 2097152 |
| 9 | 6561 |
| 10 | 1001000 |
| 11 | 11 |
| 12 | 8916136280064 |
| 13 | 13 |
| 14 | 1475791800 |
| 15 | 11441250 |
| 16 | 1152921504606846976 |
| 17 | 17 |
| 18 | 21979796247097344 |
| 19 | 19 |
| 20 | 262144000000001280000000 |
| 21 | 37823053842 |
| 22 | 12855002631059864 |
| 23 | 23 |
| 24 | 442501521100279866178075737690262732800 |
| 25 | 244140625 |