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 | 3 |
| 2 | 24 |
| 3 | 192 |
| 4 | 1536 |
| 5 | 12288 |
| 6 | 98304 |
| 7 | 786432 |
| 8 | 6291456 |
| 9 | 50331648 |
| 10 | 402653184 |
| 11 | 3221225472 |
| 12 | 25769803776 |
| 13 | 206158430208 |
| 14 | 1649267441664 |
| 15 | 13194139533312 |
| 16 | 105553116266496 |
| 17 | 844424930131968 |
| 18 | 6755399441055744 |
| 19 | 54043195528445952 |
| 20 | 432345564227567616 |