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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 184 |
| 4 | 16936 |
| 5 | 2711904 |
| 6 | 675457000 |
| 7 | 232383728378 |
| 8 | 105676839790294 |
| 9 | 61466235823794521 |
| 10 | 44524673319233300950 |
| 11 | 39314601406037457009543 |
| 12 | 41574584860907056125473119 |
| 13 | 51879840704758774687928224799 |
| 14 | 75441055286834286248687362255451 |
| 15 | 126462548502721304612260672370098185 |