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 | 127 |
| 8 | 251 |
| 9 | 496 |
| 10 | 981 |
| 11 | 1940 |
| 12 | 3837 |
| 13 | 7590 |
| 14 | 15015 |
| 15 | 29704 |
| 16 | 58763 |
| 17 | 116249 |
| 18 | 229971 |
| 19 | 454942 |
| 20 | 899991 |
| 21 | 1780410 |
| 22 | 3522102 |
| 23 | 6967611 |
| 24 | 13783703 |
| 25 | 27267665 |
| 26 | 53942368 |
| 27 | 106711708 |
| 28 | 211102869 |
| 29 | 417615105 |
| 30 | 826148769 |
| 31 | 1634332138 |