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 | 10 |
| 5 | 203 |
| 6 | 1719 |
| 7 | 9484 |
| 8 | 40615 |
| 9 | 147760 |
| 10 | 481849 |
| 11 | 1458335 |
| 12 | 4194686 |
| 13 | 11658332 |
| 14 | 31674918 |
| 15 | 84807212 |
| 16 | 224985864 |
| 17 | 593525255 |
| 18 | 1560542957 |
| 19 | 4095205128 |
| 20 | 10735046293 |
| 21 | 28123686540 |
| 22 | 73654666767 |
| 23 | 192865240859 |
| 24 | 504973920796 |
| 25 | 1322099323816 |
| 26 | 3461379173004 |
| 27 | 9062108456296 |