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 | 48 |
| 2 | 2304 |
| 3 | 110592 |
| 4 | 5308416 |
| 5 | 254803968 |
| 6 | 12230590464 |
| 7 | 587068342272 |
| 8 | 28179280429056 |
| 9 | 1352605460594688 |
| 10 | 64925062108545024 |
| 11 | 3116402981210161152 |
| 12 | 149587343098087735296 |
| 13 | 7180192468708211294208 |
| 14 | 344649238497994142121984 |
| 15 | 16543163447903718821855232 |