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 | 360 |
| 2 | 24840 |
| 3 | -465120 |
| 4 | 57417480 |
| 5 | -6800282640 |
| 6 | 930889890720 |
| 7 | -139401582644160 |
| 8 | 22250341370421000 |
| 9 | -3723955494287559480 |
| 10 | 646515765251485521840 |
| 11 | -115559140273640812421280 |
| 12 | 21150946022800731753255840 |
| 13 | -3948247836773858791840263120 |