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) |
|---|---|
| 5 | 1 |
| 6 | -182 |
| 7 | 49777 |
| 8 | -11662040 |
| 9 | 2869444942 |
| 10 | -694405675964 |
| 11 | 168973319623174 |
| 12 | -41041673208656120 |
| 13 | 9974653139743515223 |
| 14 | -2423717068608654822146 |
| 15 | 588973263031690760850991 |
| 16 | -143119691677080990521708240 |