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 | -8 |
| 3 | 28 |
| 4 | -64 |
| 5 | 142 |
| 6 | -352 |
| 7 | 792 |
| 8 | -1536 |
| 9 | 2917 |
| 10 | -5744 |
| 11 | 10868 |
| 12 | -19200 |
| 13 | 33414 |
| 14 | -58816 |
| 15 | 101256 |
| 16 | -167936 |
| 17 | 275314 |
| 18 | -452392 |
| 19 | 732748 |
| 20 | -1160064 |
| 21 | 1819808 |
| 22 | -2851104 |
| 23 | 4421064 |
| 24 | -6752256 |
| 25 | 10236407 |
| 26 | -15476272 |
| 27 | 23215192 |
| 28 | -34450944 |
| 29 | 50811638 |
| 30 | -74701632 |
| 31 | 109138272 |
| 32 | -158171136 |