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) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 64 |
| 3 | 576 |
| 4 | 4096 |
| 5 | 25600 |
| 6 | 147456 |
| 7 | 802816 |
| 8 | 4194304 |
| 9 | 21233664 |
| 10 | 104857600 |
| 11 | 507510784 |
| 12 | 2415919104 |
| 13 | 11341398016 |
| 14 | 52613349376 |
| 15 | 241591910400 |
| 16 | 1099511627776 |
| 17 | 4964982194176 |
| 18 | 22265110462464 |
| 19 | 99230924406784 |
| 20 | 439804651110400 |
| 21 | 1939538511396864 |
| 22 | 8514618045497344 |
| 23 | 37225065669984256 |