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) |
|---|---|
| 3 | 1 |
| 4 | 8 |
| 5 | 129 |
| 6 | 967 |
| 7 | 4950 |
| 8 | 20175 |
| 9 | 70954 |
| 10 | 226007 |
| 11 | 672959 |
| 12 | 1914166 |
| 13 | 5280288 |
| 14 | 14275838 |
| 15 | 38102976 |
| 16 | 100888126 |
| 17 | 265838881 |
| 18 | 698489013 |
| 19 | 1832277574 |
| 20 | 4802042229 |
| 21 | 12578921258 |
| 22 | 32941567397 |
| 23 | 86254888591 |
| 24 | 225835057708 |
| 25 | 591265802288 |
| 26 | 1547982265500 |
| 27 | 4052706300752 |