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 | -1 |
| 2 | 7 |
| 3 | -9 |
| 4 | 10 |
| 5 | -23 |
| 6 | 38 |
| 7 | -47 |
| 8 | 75 |
| 9 | -112 |
| 10 | 148 |
| 11 | -217 |
| 12 | 293 |
| 13 | -385 |
| 14 | 553 |
| 15 | -728 |
| 16 | 928 |
| 17 | -1272 |
| 18 | 1670 |
| 19 | -2111 |
| 20 | 2765 |
| 21 | -3566 |
| 22 | 4504 |
| 23 | -5784 |
| 24 | 7300 |
| 25 | -9123 |
| 26 | 11592 |
| 27 | -14458 |
| 28 | 17838 |
| 29 | -22342 |
| 30 | 27668 |
| 31 | -33884 |
| 32 | 41843 |
| 33 | -51344 |
| 34 | 62548 |
| 35 | -76515 |
| 36 | 92989 |
| 37 | -112514 |
| 38 | 136687 |
| 39 | -164961 |
| 40 | 198190 |
| 41 | -238991 |