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 | -4 |
| 2 | 5 |
| 3 | -6 |
| 4 | 13 |
| 5 | -16 |
| 6 | 25 |
| 7 | -42 |
| 8 | 57 |
| 9 | -92 |
| 10 | 141 |
| 11 | -206 |
| 12 | 325 |
| 13 | -488 |
| 14 | 737 |
| 15 | -1138 |
| 16 | 1713 |
| 17 | -2612 |
| 18 | 3989 |
| 19 | -6038 |
| 20 | 9213 |
| 21 | -14016 |
| 22 | 21289 |
| 23 | -32442 |
| 24 | 49321 |
| 25 | -75020 |
| 26 | 114205 |
| 27 | -173662 |
| 28 | 264245 |
| 29 | -402072 |
| 30 | 611569 |
| 31 | -930562 |
| 32 | 1415713 |
| 33 | -2153700 |
| 34 | 3276837 |
| 35 | -4985126 |
| 36 | 7584237 |