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 | 0 |
| 2 | 3 |
| 3 | 6 |
| 4 | 12 |
| 5 | 24 |
| 6 | 48 |
| 7 | 96 |
| 8 | 192 |
| 9 | 384 |
| 10 | 768 |
| 11 | 1536 |
| 12 | 3072 |
| 13 | 6144 |
| 14 | 12288 |
| 15 | 16383 |
| 16 | 24576 |
| 17 | 32766 |
| 18 | 49152 |
| 19 | 65532 |
| 20 | 98304 |
| 21 | 131064 |
| 22 | 196608 |
| 23 | 262128 |
| 24 | 393216 |
| 25 | 524256 |
| 26 | 786432 |
| 27 | 1048512 |
| 28 | 1572864 |
| 29 | 2097024 |
| 30 | 3145728 |
| 31 | 4194048 |
| 32 | 6291456 |
| 33 | 8388096 |
| 34 | 12582912 |
| 35 | 16776192 |
| 36 | 25165824 |
| 37 | 33552384 |
| 38 | 50331648 |
| 39 | 67104768 |
| 40 | 100663296 |
| 41 | 134209536 |
| 42 | 201326592 |