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 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -2 |
| 8 | 1 |
| 9 | 0 |
| 10 | 1 |
| 11 | -4 |
| 12 | 6 |
| 13 | -3 |
| 14 | 0 |
| 15 | 1 |
| 16 | -6 |
| 17 | 15 |
| 18 | -17 |
| 19 | 7 |
| 20 | 0 |
| 21 | 1 |
| 22 | -9 |
| 23 | 36 |
| 24 | -75 |
| 25 | 78 |
| 26 | -31 |
| 27 | 0 |
| 28 | 1 |
| 29 | -12 |
| 30 | 66 |
| 31 | -202 |
| 32 | 351 |
| 33 | -319 |
| 34 | 115 |
| 35 | 0 |
| 36 | 1 |
| 37 | -16 |
| 38 | 120 |
| 39 | -524 |
| 40 | 1400 |
| 41 | -2236 |
| 42 | 1930 |
| 43 | -675 |
| 44 | 0 |
| 45 | 1 |
| 46 | -20 |
| 47 | 190 |
| 48 | -1080 |
| 49 | 3925 |
| 50 | -9164 |
| 51 | 13186 |
| 52 | -10489 |
| 53 | 3451 |
| 54 | 0 |
| 55 | 1 |
| 56 | -25 |
| 57 | 300 |
| 58 | -2200 |
| 59 | 10650 |
| 60 | -34730 |
| 61 | 75170 |
| 62 | -102545 |
| 63 | 78610 |
| 64 | -25231 |
| 65 | 0 |