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 | 54 |
| 2 | 994 |
| 3 | -153900 |
| 4 | -14042004 |
| 5 | 424914984 |
| 6 | 157889067576 |
| 7 | 3625890053616 |
| 8 | -1928441452272240 |
| 9 | -159887523887100576 |
| 10 | 24724253951501776416 |
| 11 | 4408147922491168997184 |
| 12 | -284680189228127431139136 |
| 13 | -117042253902655203032565120 |
| 14 | 792737497310611030683935616 |