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 | 8 |
| 2 | -4015 |
| 3 | -530712 |
| 4 | -16770655 |
| 5 | -244081576 |
| 6 | -2176250895 |
| 7 | -13836504232 |
| 8 | -68676430015 |
| 9 | -282042115992 |
| 10 | -996513215599 |
| 11 | -3107047317112 |
| 12 | -8633670911775 |
| 13 | -20756219294152 |
| 14 | -33817119920335 |
| 15 | 76144794204024 |
| 16 | 1571545212141185 |
| 17 | 16094559462436808 |
| 18 | 148937803915572945 |