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 | 5 |
| 1 | 6 |
| 2 | 8 |
| 3 | 12 |
| 4 | 20 |
| 5 | 36 |
| 6 | 68 |
| 7 | 132 |
| 8 | 260 |
| 9 | 516 |
| 10 | 1028 |
| 11 | 2052 |
| 12 | 4100 |
| 13 | 8196 |
| 14 | 16388 |
| 15 | 32772 |
| 16 | 65540 |
| 17 | 131076 |
| 18 | 262148 |
| 19 | 524292 |
| 20 | 1048580 |
| 21 | 2097156 |
| 22 | 4194308 |
| 23 | 8388612 |
| 24 | 16777220 |
| 25 | 33554436 |
| 26 | 67108868 |
| 27 | 134217732 |
| 28 | 268435460 |
| 29 | 536870916 |
| 30 | 1073741828 |