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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 114 |
| 5 | 879 |
| 6 | 4284 |
| 7 | 15729 |
| 8 | 47565 |
| 9 | 124803 |
| 10 | 293733 |
| 11 | 634293 |
| 12 | 1277133 |
| 13 | 2426424 |
| 14 | 4389567 |
| 15 | 7615062 |
| 16 | 12739902 |
| 17 | 20647962 |
| 18 | 32540958 |
| 19 | 50023656 |
| 20 | 75205116 |
| 21 | 110817861 |
| 22 | 160356966 |
| 23 | 228241167 |
| 24 | 319998195 |
| 25 | 442476645 |
| 26 | 604086795 |
| 27 | 815072895 |
| 28 | 1087819551 |