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 | 0 |
| 3 | -1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 0 |
| 7 | -9 |
| 8 | 3 |
| 9 | 0 |
| 10 | -2 |
| 11 | -21 |
| 12 | 2 |
| 13 | -51 |
| 14 | -10 |
| 15 | -3 |
| 16 | 9 |
| 17 | -111 |
| 18 | 3 |
| 19 | -237 |
| 20 | 0 |
| 21 | -15 |
| 22 | -26 |
| 23 | -489 |
| 24 | 10 |
| 25 | -2 |
| 26 | -70 |
| 27 | 2 |
| 28 | -12 |
| 29 | -995 |
| 30 | 0 |
| 31 | -2017 |
| 32 | 21 |
| 33 | -39 |
| 34 | -158 |
| 35 | -19 |
| 36 | 15 |
| 37 | -4059 |
| 38 | -346 |
| 39 | -105 |
| 40 | 12 |
| 41 | -8151 |
| 42 | -18 |
| 43 | -16341 |
| 44 | -36 |
| 45 | -5 |
| 46 | -722 |
| 47 | -32721 |
| 48 | 26 |
| 49 | -32 |
| 50 | 5 |
| 51 | -237 |
| 52 | -108 |
| 53 | -65483 |
| 54 | 19 |
| 55 | -53 |