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) |
|---|---|
| 2 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 18 |
| 6 | 36 |
| 7 | 68 |
| 8 | 136 |
| 9 | 264 |
| 10 | 528 |
| 11 | 1040 |
| 12 | 2080 |
| 13 | 4128 |
| 14 | 8256 |
| 15 | 16448 |
| 16 | 32896 |
| 17 | 65664 |
| 18 | 131328 |
| 19 | 262400 |
| 20 | 524800 |
| 21 | 1049088 |
| 22 | 2098176 |
| 23 | 4195328 |
| 24 | 8390656 |
| 25 | 16779264 |
| 26 | 33558528 |
| 27 | 67112960 |
| 28 | 134225920 |
| 29 | 268443648 |