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 | 1 |
| 1 | 20 |
| 2 | 400 |
| 3 | 8000 |
| 4 | 160000 |
| 5 | 3200000 |
| 6 | 64000000 |
| 7 | 1280000000 |
| 8 | 25600000000 |
| 9 | 512000000000 |
| 10 | 10240000000000 |
| 11 | 204800000000000 |
| 12 | 4096000000000000 |
| 13 | 81920000000000000 |
| 14 | 1638400000000000000 |
| 15 | 32768000000000000000 |