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 | 2305 |
| 3 | 110688 |
| 4 | 5315329 |
| 5 | 255246480 |
| 6 | 12257146369 |
| 7 | 588598272192 |
| 8 | 28264974211585 |
| 9 | 1357307360428272 |
| 10 | 65179018274768641 |
| 11 | 3129950184549323040 |
| 12 | 150302787876642274561 |
| 13 | 7217663768263378501968 |
| 14 | 346598163664518810369025 |
| 15 | 16643929519665166276215168 |