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) |
|---|---|
| 2 | -2 |
| 3 | -6 |
| 4 | -15 |
| 5 | -35 |
| 6 | -78 |
| 7 | -166 |
| 8 | -345 |
| 9 | -707 |
| 10 | -1435 |
| 11 | -2899 |
| 12 | -5835 |
| 13 | -11721 |
| 14 | -23507 |
| 15 | -47101 |
| 16 | -94318 |
| 17 | -188791 |
| 18 | -377786 |
| 19 | -755845 |
| 20 | -1512052 |
| 21 | -3024587 |
| 22 | -6049818 |
| 23 | -12100492 |
| 24 | -24202125 |
| 25 | -48405772 |
| 26 | -96813572 |
| 27 | -193629847 |
| 28 | -387263296 |