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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 32 |
| 6 | 64 |
| 7 | 128 |
| 8 | 256 |
| 9 | 511 |
| 10 | 1019 |
| 11 | 2031 |
| 12 | 4047 |
| 13 | 8063 |
| 14 | 16063 |
| 15 | 31999 |
| 16 | 63743 |
| 17 | 126976 |
| 18 | 252934 |
| 19 | 503838 |
| 20 | 1003630 |
| 21 | 1999198 |
| 22 | 3982334 |
| 23 | 7932670 |
| 24 | 15801598 |
| 25 | 31476221 |
| 26 | 62699509 |
| 27 | 124895181 |
| 28 | 248786733 |
| 29 | 495574269 |
| 30 | 987166205 |
| 31 | 1966399741 |
| 32 | 3916997885 |
| 33 | 7802519550 |