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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 1 |
| 13 | 2 |
| 14 | 4 |
| 15 | 8 |
| 16 | 16 |
| 17 | 32 |
| 18 | 64 |
| 19 | 128 |
| 20 | 256 |
| 21 | 512 |
| 22 | 1024 |
| 23 | 2047 |
| 24 | 4093 |
| 25 | 8184 |
| 26 | 16364 |
| 27 | 32720 |
| 28 | 65424 |
| 29 | 130816 |
| 30 | 261568 |
| 31 | 523008 |
| 32 | 1045760 |
| 33 | 2091008 |
| 34 | 4180992 |
| 35 | 8359937 |
| 36 | 16715781 |
| 37 | 33423378 |
| 38 | 66830392 |
| 39 | 133628064 |
| 40 | 267190704 |
| 41 | 534250592 |
| 42 | 1068239616 |