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 | 2 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | -6 |
| 7 | 0 |
| 8 | -7 |
| 9 | 9 |
| 10 | -4 |
| 11 | 0 |
| 12 | 21 |
| 13 | 0 |
| 14 | 4 |
| 15 | 12 |
| 16 | 13 |
| 17 | 0 |
| 18 | -9 |
| 19 | 0 |
| 20 | -10 |
| 21 | -12 |
| 22 | -16 |
| 23 | 0 |
| 24 | -3 |
| 25 | 4 |
| 26 | -26 |
| 27 | 27 |
| 28 | -32 |
| 29 | 0 |
| 30 | 72 |
| 31 | 0 |
| 32 | -1 |
| 33 | 48 |
| 34 | -10 |
| 35 | -8 |
| 36 | 36 |
| 37 | 0 |
| 38 | 16 |
| 39 | 78 |
| 40 | 94 |
| 41 | 0 |
| 42 | 54 |
| 43 | 0 |
| 44 | 50 |
| 45 | 18 |
| 46 | 14 |
| 47 | 0 |
| 48 | 3 |
| 49 | 4 |
| 50 | 74 |
| 51 | 30 |
| 52 | 91 |
| 53 | 0 |
| 54 | -27 |
| 55 | 32 |
| 56 | -25 |
| 57 | -48 |
| 58 | -52 |
| 59 | 0 |
| 60 | -30 |
| 61 | 0 |
| 62 | -62 |
| 63 | -18 |
| 64 | -74 |
| 65 | 52 |
| 66 | 18 |
| 67 | 0 |
| 68 | -25 |
| 69 | -42 |
| 70 | -66 |
| 71 | 0 |
| 72 | -36 |
| 73 | 0 |
| 74 | -74 |
| 75 | -78 |
| 76 | -110 |
| 77 | -32 |
| 78 | 0 |
| 79 | 0 |
| 80 | -40 |
| 81 | 81 |