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 | 1 |
| 3 | 5 |
| 4 | 64 |
| 5 | 400 |
| 6 | 1914 |
| 7 | 7589 |
| 8 | 24902 |
| 9 | 73134 |
| 10 | 188315 |
| 11 | 455127 |
| 12 | 996083 |
| 13 | 2098908 |
| 14 | 4080930 |
| 15 | 7790731 |
| 16 | 13869018 |
| 17 | 24527424 |
| 18 | 40768032 |
| 19 | 67955336 |
| 20 | 106952861 |
| 21 | 169909977 |
| 22 | 255608028 |
| 23 | 390623704 |
| 24 | 566247614 |
| 25 | 837326375 |
| 26 | 1175991196 |
| 27 | 1690928973 |