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 | 216 |
| 2 | -3672 |
| 3 | -62496 |
| 4 | -322488 |
| 5 | -1121904 |
| 6 | -2969568 |
| 7 | -6737472 |
| 8 | -13678200 |
| 9 | -24978312 |
| 10 | -43826832 |
| 11 | -70620768 |
| 12 | -112325472 |
| 13 | -166558896 |
| 14 | -248342976 |
| 15 | -346320576 |
| 16 | -491604984 |
| 17 | -655461072 |
| 18 | -897864696 |
| 19 | -1154109600 |
| 20 | -1532856528 |
| 21 | -1921344768 |
| 22 | -2488726944 |
| 23 | -3042415296 |
| 24 | -3876616800 |
| 25 | -4639932504 |