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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 18 |
| 7 | 36 |
| 8 | 72 |
| 9 | 145 |
| 10 | 291 |
| 11 | 583 |
| 12 | 1167 |
| 13 | 2336 |
| 14 | 4675 |
| 15 | 9354 |
| 16 | 18713 |
| 17 | 37433 |
| 18 | 74876 |
| 19 | 149766 |
| 20 | 299551 |
| 21 | 599128 |
| 22 | 1198292 |
| 23 | 2396634 |
| 24 | 4793337 |
| 25 | 9586769 |
| 26 | 19173669 |
| 27 | 38347519 |
| 28 | 76695288 |
| 29 | 153390921 |
| 30 | 306782318 |
| 31 | 613565293 |
| 32 | 1227131493 |
| 33 | 2454264238 |