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 | 16 |
| 3 | 1458 |
| 4 | 196608 |
| 5 | 39062500 |
| 6 | 10883911680 |
| 7 | 4069338437094 |
| 8 | 1970324836974592 |
| 9 | 1200757082375992968 |
| 10 | 900000000000000000000 |
| 11 | 814027493868397611133210 |
| 12 | 874465319237299285467856896 |
| 13 | 1100799962319223399900795392108 |