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 | 0 |
| 1 | -1 |
| 2 | 0 |
| 3 | -9 |
| 4 | -4 |
| 5 | -10 |
| 6 | -6 |
| 7 | -7 |
| 8 | 8 |
| 9 | -36 |
| 10 | -10 |
| 11 | -11 |
| 12 | -24 |
| 13 | -13 |
| 14 | 28 |
| 15 | 0 |
| 16 | -16 |
| 17 | 0 |
| 18 | -54 |
| 19 | -19 |
| 20 | -40 |
| 21 | -21 |
| 22 | -22 |
| 23 | 23 |
| 24 | -96 |
| 25 | -25 |
| 26 | -26 |
| 27 | -54 |
| 28 | -28 |
| 29 | 58 |
| 30 | 0 |
| 31 | -31 |
| 32 | 0 |
| 33 | -99 |
| 34 | -34 |
| 35 | -70 |
| 36 | -36 |
| 37 | -37 |
| 38 | 38 |
| 39 | -156 |
| 40 | -40 |
| 41 | -41 |
| 42 | -84 |
| 43 | -43 |
| 44 | 88 |
| 45 | 0 |
| 46 | -46 |
| 47 | 0 |
| 48 | -144 |
| 49 | -49 |
| 50 | -100 |
| 51 | -51 |
| 52 | -52 |
| 53 | 53 |
| 54 | -216 |
| 55 | -55 |
| 56 | -56 |
| 57 | -114 |
| 58 | -58 |
| 59 | 118 |
| 60 | 0 |
| 61 | -61 |
| 62 | 0 |
| 63 | -189 |
| 64 | -64 |
| 65 | -130 |
| 66 | -66 |
| 67 | -67 |
| 68 | 68 |
| 69 | -276 |
| 70 | -70 |
| 71 | -71 |
| 72 | -144 |
| 73 | -73 |
| 74 | 148 |
| 75 | 0 |