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 | 7 |
| 3 | 194 |
| 4 | 13005 |
| 5 | 1660964 |
| 6 | 363083155 |
| 7 | 125447139558 |
| 8 | 64534483387801 |
| 9 | 47199368682436040 |
| 10 | 47309812970969661471 |
| 11 | 63078455495155600593290 |
| 12 | 109143265990975402533003877 |
| 13 | 240033842542243124391262433004 |