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 | -2 |
| 3 | 2 |
| 4 | -3 |
| 5 | -2 |
| 6 | 13 |
| 7 | -5 |
| 8 | -9 |
| 9 | 35 |
| 10 | -25 |
| 11 | -34 |
| 12 | 91 |
| 13 | -78 |
| 14 | -102 |
| 15 | 240 |
| 16 | -192 |
| 17 | -233 |
| 18 | 665 |
| 19 | -441 |
| 20 | -553 |
| 21 | 1636 |
| 22 | -1063 |
| 23 | -1327 |
| 24 | 3869 |
| 25 | -2565 |
| 26 | -3229 |
| 27 | 8738 |
| 28 | -6032 |
| 29 | -7446 |
| 30 | 19568 |
| 31 | -13469 |
| 32 | -16499 |
| 33 | 43083 |
| 34 | -29101 |
| 35 | -35282 |
| 36 | 93458 |
| 37 | -61544 |
| 38 | -74539 |
| 39 | 198072 |
| 40 | -128917 |
| 41 | -155580 |
| 42 | 412116 |
| 43 | -267021 |