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 | -8 |
| 3 | -24 |
| 4 | -80 |
| 5 | -192 |
| 6 | -512 |
| 7 | -1152 |
| 8 | -2816 |
| 9 | -6144 |
| 10 | -14336 |
| 11 | -30720 |
| 12 | -69632 |
| 13 | -147456 |
| 14 | -327680 |
| 15 | -688128 |
| 16 | -1507328 |
| 17 | -3145728 |
| 18 | -6815744 |
| 19 | -14155776 |
| 20 | -30408704 |
| 21 | -62914560 |
| 22 | -134217728 |
| 23 | -276824064 |
| 24 | -587202560 |
| 25 | -1207959552 |
| 26 | -2550136832 |