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 | 30 |
| 6 | 58 |
| 7 | 112 |
| 8 | 216 |
| 9 | 416 |
| 10 | 802 |
| 11 | 1546 |
| 12 | 2980 |
| 13 | 5744 |
| 14 | 11072 |
| 15 | 21342 |
| 16 | 41138 |
| 17 | 79296 |
| 18 | 152848 |
| 19 | 294624 |
| 20 | 567906 |
| 21 | 1094674 |
| 22 | 2110052 |
| 23 | 4067256 |
| 24 | 7839888 |
| 25 | 15111870 |
| 26 | 29129066 |
| 27 | 56148080 |
| 28 | 108228904 |
| 29 | 208617920 |
| 30 | 402123970 |
| 31 | 775118874 |
| 32 | 1494089668 |
| 33 | 2879950432 |