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 | 0 |
| 4 | 0 |
| 5 | 978 |
| 6 | 62266 |
| 7 | 1220298 |
| 8 | 12033330 |
| 9 | 77784658 |
| 10 | 377818258 |
| 11 | 1492665418 |
| 12 | 5042436754 |
| 13 | 15062292834 |
| 14 | 40736208186 |
| 15 | 101489568538 |
| 16 | 235984235970 |
| 17 | 517314078210 |
| 18 | 1077720399538 |
| 19 | 2147500025914 |
| 20 | 4114538426818 |
| 21 | 7613150953522 |
| 22 | 13653752767866 |
| 23 | 23808409699242 |