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) |
|---|---|
| 5 | 1 |
| 6 | 6 |
| 7 | 36 |
| 8 | 176 |
| 9 | 856 |
| 10 | 3952 |
| 11 | 18272 |
| 12 | 83524 |
| 13 | 384463 |
| 14 | 1777010 |
| 15 | 8304636 |
| 16 | 39254076 |
| 17 | 188160268 |
| 18 | 915651672 |
| 19 | 4527595824 |
| 20 | 22771294440 |
| 21 | 116496899100 |
| 22 | 606656445480 |
| 23 | 3214574890480 |
| 24 | 17337658462800 |
| 25 | 95128543350576 |
| 26 | 530998366724576 |
| 27 | 3013524116661952 |
| 28 | 17385349086129304 |