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 | 210 |
| 2 | 31356 |
| 3 | 4150440 |
| 4 | 521757936 |
| 5 | 64043874720 |
| 6 | 7771495098816 |
| 7 | 937759335004800 |
| 8 | 112842062355914496 |
| 9 | 13559707534436743680 |
| 10 | 1628284591773850622976 |
| 11 | 195461334300256627599360 |