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 | 1 |
| 6 | 96 |
| 7 | 1834 |
| 8 | 28439 |
| 9 | 371839 |
| 10 | 4404886 |
| 11 | 48938947 |
| 12 | 521616486 |
| 13 | 5401237011 |
| 14 | 54805745434 |
| 15 | 548075949031 |
| 16 | 5423125663893 |
| 17 | 53243632952888 |
| 18 | 519719164238055 |