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 | 2 |
| 2 | 8 |
| 3 | 106 |
| 4 | 4728 |
| 5 | 697288 |
| 6 | 341056672 |
| 7 | 561635549128 |
| 8 | 3172355531357504 |
| 9 | 62573893999774791616 |
| 10 | 4377792727679018712191744 |
| 11 | 1100465546170585425117622597248 |
| 12 | 1004426091768772936789017838438890496 |