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 | 6 |
| 2 | 16 |
| 3 | 40 |
| 4 | 384 |
| 5 | 576 |
| 6 | 4096 |
| 7 | 10240 |
| 8 | 17408 |
| 9 | 393216 |
| 10 | 589824 |
| 11 | 1081344 |
| 12 | 16777216 |
| 13 | 41943040 |
| 14 | 71303168 |
| 15 | 136314880 |
| 16 | 6442450944 |
| 17 | 9663676416 |
| 18 | 17716740096 |
| 19 | 34628173824 |
| 20 | 1099511627776 |