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 | 32 |
| 3 | -96 |
| 4 | 256 |
| 5 | -624 |
| 6 | 1408 |
| 7 | -3008 |
| 8 | 6144 |
| 9 | -12072 |
| 10 | 22976 |
| 11 | -42528 |
| 12 | 76800 |
| 13 | -135728 |
| 14 | 235264 |
| 15 | -400704 |
| 16 | 671744 |
| 17 | -1109904 |
| 18 | 1809568 |
| 19 | -2914272 |
| 20 | 4640256 |
| 21 | -7310592 |
| 22 | 11404416 |
| 23 | -17626944 |
| 24 | 27009024 |
| 25 | -41047992 |
| 26 | 61905088 |
| 27 | -92681664 |
| 28 | 137803776 |
| 29 | -203554224 |