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 | 0 |
| 2 | -1 |
| 3 | 2 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 2 |
| 8 | 1 |
| 9 | -4 |
| 10 | 12 |
| 11 | 0 |
| 12 | -12 |
| 13 | -4 |
| 14 | 7 |
| 15 | 44 |
| 16 | 48 |
| 17 | 0 |
| 18 | -48 |
| 19 | 44 |
| 20 | 345 |
| 21 | 334 |
| 22 | -1196 |
| 23 | 2328 |
| 24 | 4796 |
| 25 | 8022 |
| 26 | -35417 |
| 27 | 123840 |
| 28 | -118503 |
| 29 | 89082 |
| 30 | 48160 |
| 31 | -414248 |
| 32 | 2107104 |
| 33 | -2358342 |
| 34 | -27802725 |
| 35 | -168156872 |
| 36 | 415198413 |
| 37 | 804518348 |
| 38 | -2450715149 |
| 39 | -711441100 |
| 40 | 3648319725 |
| 41 | -2721771200 |
| 42 | -17289389524 |
| 43 | 205130688 |