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 | 0 |
| 2 | -63 |
| 3 | -728 |
| 4 | -4095 |
| 5 | -15624 |
| 6 | -46655 |
| 7 | -117648 |
| 8 | -262143 |
| 9 | -531440 |
| 10 | -999999 |
| 11 | -1771560 |
| 12 | -2985983 |
| 13 | -4826808 |
| 14 | -7529535 |
| 15 | -11390624 |
| 16 | -16777215 |
| 17 | -24137568 |
| 18 | -34012223 |
| 19 | -47045880 |
| 20 | -63999999 |
| 21 | -85766120 |
| 22 | -113379903 |
| 23 | -148035888 |
| 24 | -191102975 |
| 25 | -244140624 |
| 26 | -308915775 |
| 27 | -387420488 |
| 28 | -481890303 |