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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 16 |
| 5 | 160 |
| 6 | 640 |
| 7 | 2048 |
| 8 | 12288 |
| 9 | 24576 |
| 10 | 32768 |
| 11 | 327680 |
| 12 | 786432 |
| 13 | 10485760 |
| 14 | 62914560 |
| 15 | 125829120 |
| 16 | 167772160 |
| 17 | 9730785280 |
| 18 | 583847116800 |
| 19 | 3503082700800 |
| 20 | 245215789056000 |