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 | 90 |
| 1 | -8028 |
| 2 | 459855 |
| 3 | -22166430 |
| 4 | 991865875 |
| 5 | -43155112000 |
| 6 | 1871623083330 |
| 7 | -82074799907100 |
| 8 | 3670430981817600 |
| 9 | -168269191527937500 |
| 10 | 7933301574849275625 |
| 11 | -385378337023784354250 |
| 12 | 19309132829440209380625 |
| 13 | -998382450032876448540000 |
| 14 | 53277504029278691474812500 |