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 | 0 |
| 2 | -3 |
| 3 | 1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 0 |
| 7 | 3 |
| 8 | 1 |
| 9 | -6 |
| 10 | 9 |
| 11 | -1 |
| 12 | 1 |
| 13 | -9 |
| 14 | 24 |
| 15 | -17 |
| 16 | 1 |
| 17 | -12 |
| 18 | 45 |
| 19 | -51 |
| 20 | 1 |
| 21 | -15 |
| 22 | 72 |
| 23 | -109 |
| 24 | 1 |
| 25 | -18 |
| 26 | 105 |
| 27 | -197 |
| 28 | 1 |
| 29 | -21 |
| 30 | 144 |
| 31 | -321 |
| 32 | 1 |
| 33 | -24 |
| 34 | 189 |
| 35 | -487 |
| 36 | 1 |
| 37 | -27 |
| 38 | 240 |
| 39 | -701 |
| 40 | 1 |
| 41 | -30 |
| 42 | 297 |
| 43 | -969 |
| 44 | 1 |
| 45 | -33 |
| 46 | 360 |
| 47 | -1297 |
| 48 | 1 |
| 49 | -36 |
| 50 | 429 |
| 51 | -1691 |
| 52 | 1 |
| 53 | -39 |
| 54 | 504 |
| 55 | -2157 |
| 56 | 1 |
| 57 | -42 |
| 58 | 585 |
| 59 | -2701 |