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 | 1 |
| 2 | 130 |
| 3 | 1860 |
| 4 | 148480 |
| 5 | 3039520 |
| 6 | 4172437680 |
| 7 | 5788838100 |
| 8 | 38341734200 |
| 9 | 41251514850 |
| 10 | 54116036100 |
| 11 | 78936002964 |
| 12 | 1059758860356 |