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 | 0 |
| 2 | 2 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 26 |
| 7 | 58 |
| 8 | 126 |
| 9 | 278 |
| 10 | 602 |
| 11 | 1300 |
| 12 | 2774 |
| 13 | 5878 |
| 14 | 12350 |
| 15 | 25778 |
| 16 | 53470 |
| 17 | 110332 |
| 18 | 226610 |
| 19 | 463602 |
| 20 | 945214 |
| 21 | 1921550 |
| 22 | 3896642 |
| 23 | 7885092 |
| 24 | 15927086 |
| 25 | 32121582 |
| 26 | 64697726 |
| 27 | 130166378 |
| 28 | 261637446 |
| 29 | 525478668 |
| 30 | 1054673162 |
| 31 | 2115601450 |
| 32 | 4241716734 |
| 33 | 8501080838 |
| 34 | 17031744170 |