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 | 1 |
| 2 | -3 |
| 3 | -2 |
| 4 | 2 |
| 5 | -4 |
| 6 | 9 |
| 7 | -6 |
| 8 | 0 |
| 9 | -4 |
| 10 | 20 |
| 11 | -10 |
| 12 | -16 |
| 13 | -12 |
| 14 | 29 |
| 15 | 11 |
| 16 | 0 |
| 17 | -16 |
| 18 | 16 |
| 19 | -18 |
| 20 | -43 |
| 21 | 18 |
| 22 | 49 |
| 23 | -22 |
| 24 | 18 |
| 25 | -8 |
| 26 | 60 |
| 27 | -2 |
| 28 | -43 |
| 29 | -28 |
| 30 | -89 |
| 31 | -30 |
| 32 | 0 |
| 33 | 29 |
| 34 | 80 |
| 35 | 34 |
| 36 | 1 |
| 37 | -36 |
| 38 | 89 |
| 39 | 36 |
| 40 | 71 |
| 41 | -40 |
| 42 | -136 |
| 43 | -42 |
| 44 | -96 |
| 45 | 27 |
| 46 | 109 |
| 47 | -46 |
| 48 | -18 |
| 49 | -12 |
| 50 | 8 |
| 51 | 47 |
| 52 | -123 |
| 53 | -52 |
| 54 | -19 |
| 55 | 70 |
| 56 | -25 |
| 57 | 54 |
| 58 | 140 |
| 59 | -58 |
| 60 | 326 |
| 61 | -60 |
| 62 | 149 |
| 63 | 21 |
| 64 | 0 |
| 65 | 71 |
| 66 | -201 |
| 67 | -66 |
| 68 | -128 |
| 69 | 65 |
| 70 | -264 |
| 71 | -70 |
| 72 | -140 |
| 73 | -72 |
| 74 | 180 |
| 75 | 16 |