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 | 3 |
| 2 | 6 |
| 3 | 13 |
| 4 | 26 |
| 5 | 52 |
| 6 | 104 |
| 7 | 209 |
| 8 | 418 |
| 9 | 836 |
| 10 | 1672 |
| 11 | 3344 |
| 12 | 6688 |
| 13 | 13376 |
| 14 | 26752 |
| 15 | 53505 |
| 16 | 107010 |
| 17 | 214020 |
| 18 | 428040 |
| 19 | 856080 |
| 20 | 1712160 |
| 21 | 3424320 |
| 22 | 6848640 |
| 23 | 13697280 |
| 24 | 27394560 |
| 25 | 54789120 |
| 26 | 109578240 |
| 27 | 219156480 |
| 28 | 438312960 |
| 29 | 876625920 |
| 30 | 1753251840 |
| 31 | 3506503681 |
| 32 | 7013007362 |