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 | 30 |
| 2 | -1022 |
| 3 | -145980 |
| 4 | 1513452 |
| 5 | 1167697800 |
| 6 | 20486660280 |
| 7 | -12851291221200 |
| 8 | -661166264043120 |
| 9 | 177766465895877600 |
| 10 | 16769848012294217760 |
| 11 | -2913576034149940939200 |
| 12 | -441955407700422580057920 |
| 13 | 53940055420621560419971200 |
| 14 | 12660899479421405397926325120 |