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) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | -4 |
| 4 | -4 |
| 5 | -16 |
| 6 | -16 |
| 7 | -64 |
| 8 | -104 |
| 9 | -240 |
| 10 | -448 |
| 11 | -1024 |
| 12 | -1904 |
| 13 | -4096 |
| 14 | -7936 |
| 15 | -16256 |
| 16 | -32272 |
| 17 | -65536 |
| 18 | -129888 |
| 19 | -262144 |
| 20 | -522176 |
| 21 | -1048064 |
| 22 | -2093056 |
| 23 | -4194304 |
| 24 | -8379520 |
| 25 | -16776960 |
| 26 | -33538048 |
| 27 | -67106880 |
| 28 | -134184704 |
| 29 | -268435456 |
| 30 | -536801024 |
| 31 | -1073741824 |
| 32 | -2147352224 |
| 33 | -4294959104 |
| 34 | -8589672448 |
| 35 | -17179867136 |
| 36 | -34359197184 |