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 | 48 |
| 2 | 1272 |
| 3 | 38784 |
| 4 | 1341408 |
| 5 | 52186368 |
| 6 | 2256454272 |
| 7 | 107494477824 |
| 8 | 5595152936448 |
| 9 | 316081923944448 |
| 10 | 19262189406185472 |
| 11 | 1259828274265227264 |
| 12 | 88026828815690047488 |
| 13 | 6544693787367160086528 |
| 14 | 515907116666737635459072 |
| 15 | 42981965201161894878511104 |
| 16 | 3773829205951827807017238528 |