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 | 0 |
| 1 | -1 |
| 2 | 9 |
| 3 | -26 |
| 4 | 58 |
| 5 | -107 |
| 6 | 179 |
| 7 | -276 |
| 8 | 404 |
| 9 | -565 |
| 10 | 765 |
| 11 | -1006 |
| 12 | 1294 |
| 13 | -1631 |
| 14 | 2023 |
| 15 | -2472 |
| 16 | 2984 |
| 17 | -3561 |
| 18 | 4209 |
| 19 | -4930 |
| 20 | 5730 |
| 21 | -6611 |
| 22 | 7579 |
| 23 | -8636 |
| 24 | 9788 |
| 25 | -11037 |
| 26 | 12389 |
| 27 | -13846 |
| 28 | 15414 |
| 29 | -17095 |
| 30 | 18895 |
| 31 | -20816 |
| 32 | 22864 |
| 33 | -25041 |
| 34 | 27353 |
| 35 | -29802 |
| 36 | 32394 |
| 37 | -35131 |
| 38 | 38019 |