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 | 10 |
| 2 | -958 |
| 3 | -30740 |
| 4 | 2733292 |
| 5 | 157424600 |
| 6 | -12884868680 |
| 7 | -1128180047600 |
| 8 | 84143536968080 |
| 9 | 10390351292567200 |
| 10 | -697311246084385760 |
| 11 | -116903029136204833600 |
| 12 | 6946277990568033138880 |
| 13 | 1553663637818936898774400 |
| 14 | -80002471104083358804411520 |
| 15 | -23812890514414926932690528000 |