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 | 34 |
| 2 | 434 |
| 3 | -34340 |
| 4 | -2107604 |
| 5 | 27515384 |
| 6 | 8543973496 |
| 7 | 171298455376 |
| 8 | -37357094566000 |
| 9 | -2259561093495776 |
| 10 | 165921323311011616 |
| 11 | 21955356087613897664 |
| 12 | -571265042757181733696 |
| 13 | -209644216596830988306560 |
| 14 | -1766009672973345849952384 |
| 15 | 2059039412479673870904327424 |