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 | -2 |
| 2 | 4 |
| 3 | -10 |
| 4 | 18 |
| 5 | -34 |
| 6 | 64 |
| 7 | -110 |
| 8 | 188 |
| 9 | -320 |
| 10 | 524 |
| 11 | -846 |
| 12 | 1358 |
| 13 | -2130 |
| 14 | 3308 |
| 15 | -5102 |
| 16 | 7750 |
| 17 | -11674 |
| 18 | 17468 |
| 19 | -25862 |
| 20 | 38022 |
| 21 | -55558 |
| 22 | 80532 |
| 23 | -116034 |
| 24 | 166284 |
| 25 | -236784 |
| 26 | 335416 |
| 27 | -472868 |
| 28 | 663146 |
| 29 | -925762 |
| 30 | 1286920 |
| 31 | -1780962 |
| 32 | 2454792 |
| 33 | -3370806 |
| 34 | 4610656 |
| 35 | -6284090 |
| 36 | 8535868 |
| 37 | -11554834 |