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 | -1 |
| 3 | 1 |
| 4 | -6 |
| 5 | 1 |
| 6 | 0 |
| 7 | -10 |
| 8 | 15 |
| 9 | -1 |
| 10 | -4 |
| 11 | -8 |
| 12 | 40 |
| 13 | -28 |
| 14 | 1 |
| 15 | -16 |
| 16 | 24 |
| 17 | 56 |
| 18 | -110 |
| 19 | 45 |
| 20 | -1 |
| 21 | -48 |
| 22 | 160 |
| 23 | -72 |
| 24 | -224 |
| 25 | 245 |
| 26 | -66 |
| 27 | 1 |
| 28 | -128 |
| 29 | 608 |
| 30 | -880 |
| 31 | 120 |
| 32 | 672 |
| 33 | -476 |
| 34 | 91 |
| 35 | -1 |
| 36 | -320 |
| 37 | 1920 |
| 38 | -4160 |
| 39 | 3520 |
| 40 | 0 |
| 41 | -1680 |
| 42 | 840 |
| 43 | -120 |
| 44 | 1 |
| 45 | -768 |
| 46 | 5504 |
| 47 | -15360 |
| 48 | 20384 |