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 | 160 |
| 3 | 3632 |
| 4 | 237297 |
| 5 | 10252800 |
| 6 | 519621497 |
| 7 | 24728774144 |
| 8 | 1206541811872 |
| 9 | 58289324009008 |
| 10 | 2827118724742121 |
| 11 | 136905250232923136 |
| 12 | 6633862748392813081 |
| 13 | 321370023775584504336 |
| 14 | 15569943269307141603680 |
| 15 | 754313155570494656470048 |