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 | 2 |
| 1 | 56 |
| 2 | 968 |
| 3 | 249728 |
| 4 | 3996680 |
| 5 | 1023152000 |
| 6 | 261926931584 |
| 7 | 17165643396644864 |
| 8 | 274650294346579976 |
| 9 | 70310475352724475776 |
| 10 | 17999481690297465818240 |
| 11 | 1179614032055334719872532480 |
| 12 | 301981192206165688287372558464 |