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 | -3 |
| 3 | 13 |
| 4 | -26 |
| 5 | 45 |
| 6 | -70 |
| 7 | 141 |
| 8 | -228 |
| 9 | 283 |
| 10 | -366 |
| 11 | 636 |
| 12 | -879 |
| 13 | 942 |
| 14 | -1232 |
| 15 | 1914 |
| 16 | -2331 |
| 17 | 2515 |
| 18 | -3090 |
| 19 | 4226 |
| 20 | -5313 |
| 21 | 5539 |
| 22 | -6114 |
| 23 | 8837 |
| 24 | -10558 |
| 25 | 9988 |
| 26 | -11947 |
| 27 | 15969 |
| 28 | -17705 |
| 29 | 18256 |
| 30 | -20364 |
| 31 | 26013 |
| 32 | -30592 |
| 33 | 29330 |
| 34 | -31874 |
| 35 | 42222 |
| 36 | -47034 |
| 37 | 44357 |
| 38 | -49602 |
| 39 | 64164 |
| 40 | -69115 |
| 41 | 66637 |
| 42 | -74017 |