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 | -3 |
| 2 | -130 |
| 3 | 2367 |
| 4 | 85670 |
| 5 | -1302843 |
| 6 | -138155290 |
| 7 | 11769651399 |
| 8 | 414816521990 |
| 9 | -11359381346253 |
| 10 | -2001108958082650 |
| 11 | 133952753515990557 |
| 12 | 14158016295416976710 |
| 13 | -560020888895209456263 |
| 14 | -138111526163646868112410 |
| 15 | 50427758398224287080561383 |
| 16 | 1776630506678835462703293830 |