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 | 4 |
| 2 | 36 |
| 3 | 144 |
| 4 | 576 |
| 5 | 2304 |
| 6 | 9216 |
| 7 | 36864 |
| 8 | 147456 |
| 9 | 589824 |
| 10 | 2359296 |
| 11 | 9437184 |
| 12 | 37748736 |
| 13 | 150994944 |
| 14 | 603979776 |
| 15 | 2415919104 |
| 16 | 9663676416 |
| 17 | 38654705664 |
| 18 | 154618822656 |
| 19 | 618475290624 |
| 20 | 2473901162496 |
| 21 | 9895604649984 |
| 22 | 39582418599936 |
| 23 | 158329674399744 |