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 | 1 |
| 3 | -3 |
| 4 | -2 |
| 5 | 1 |
| 6 | -21 |
| 7 | -7 |
| 8 | -3 |
| 9 | 1 |
| 10 | -219 |
| 11 | -53 |
| 12 | -13 |
| 13 | -4 |
| 14 | 1 |
| 15 | -2973 |
| 16 | -583 |
| 17 | -115 |
| 18 | -21 |
| 19 | -5 |
| 20 | 1 |
| 21 | -49323 |
| 22 | -8249 |
| 23 | -1437 |
| 24 | -217 |
| 25 | -31 |
| 26 | -6 |
| 27 | 1 |
| 28 | -964173 |
| 29 | -141655 |
| 30 | -22715 |
| 31 | -3101 |
| 32 | -369 |
| 33 | -43 |
| 34 | -7 |
| 35 | 1 |
| 36 | -21680571 |
| 37 | -2853185 |
| 38 | -430877 |
| 39 | -55251 |
| 40 | -5975 |
| 41 | -581 |
| 42 | -57 |
| 43 | -8 |
| 44 | 1 |
| 45 | -551173053 |
| 46 | -65887783 |
| 47 | -9505707 |
| 48 | -1168349 |
| 49 | -119137 |