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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 5 |
| 7 | 17 |
| 8 | 49 |
| 9 | 126 |
| 10 | 303 |
| 11 | 694 |
| 12 | 1536 |
| 13 | 3312 |
| 14 | 7009 |
| 15 | 14619 |
| 16 | 30164 |
| 17 | 61732 |
| 18 | 125568 |
| 19 | 254246 |
| 20 | 513048 |
| 21 | 1032696 |
| 22 | 2074875 |
| 23 | 4163256 |
| 24 | 8345605 |
| 25 | 16717996 |
| 26 | 33473334 |
| 27 | 66998380 |
| 28 | 134067959 |
| 29 | 268233386 |
| 30 | 536599508 |
| 31 | 1073378850 |
| 32 | 2147000209 |