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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 24 |
| 5 | 96 |
| 6 | 192 |
| 7 | 768 |
| 8 | 1536 |
| 9 | 6144 |
| 10 | 12288 |
| 11 | 49152 |
| 12 | 98304 |
| 13 | 393216 |
| 14 | 786432 |
| 15 | 3145728 |
| 16 | 6291456 |
| 17 | 25165824 |
| 18 | 50331648 |
| 19 | 201326592 |
| 20 | 402653184 |
| 21 | 1610612736 |
| 22 | 3221225472 |
| 23 | 12884901888 |
| 24 | 25769803776 |
| 25 | 103079215104 |
| 26 | 206158430208 |
| 27 | 824633720832 |
| 28 | 1649267441664 |
| 29 | 6597069766656 |