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 | 0 |
| 3 | 0 |
| 4 | -1 |
| 5 | 0 |
| 6 | 0 |
| 7 | -1 |
| 8 | 0 |
| 9 | 0 |
| 10 | -2 |
| 11 | 0 |
| 12 | 0 |
| 13 | -3 |
| 14 | 0 |
| 15 | 0 |
| 16 | -5 |
| 17 | 0 |
| 18 | 0 |
| 19 | -8 |
| 20 | -1 |
| 21 | 0 |
| 22 | -13 |
| 23 | -2 |
| 24 | 0 |
| 25 | -21 |
| 26 | -5 |
| 27 | 0 |
| 28 | -34 |
| 29 | -10 |
| 30 | -1 |
| 31 | -55 |
| 32 | -20 |
| 33 | -2 |
| 34 | -89 |
| 35 | -39 |
| 36 | -6 |
| 37 | -144 |
| 38 | -73 |
| 39 | -13 |
| 40 | -234 |
| 41 | -135 |
| 42 | -29 |
| 43 | -379 |
| 44 | -245 |
| 45 | -62 |
| 46 | -617 |
| 47 | -440 |
| 48 | -126 |
| 49 | -1003 |
| 50 | -784 |
| 51 | -253 |
| 52 | -1636 |
| 53 | -1383 |
| 54 | -494 |
| 55 | -2673 |
| 56 | -2429 |
| 57 | -952 |