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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | 0 |
| 4 | -32 |
| 5 | -1000 |
| 6 | -61104 |
| 7 | -6622448 |
| 8 | -1274984320 |
| 9 | -444075170688 |
| 10 | -286507347953920 |
| 11 | -349824570713902592 |
| 12 | -821921957328576534528 |
| 13 | -3760909487461975276739584 |
| 14 | -33794780371666462710538704896 |
| 15 | -599695123654141294961479035617280 |