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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | -1 |
| 6 | 0 |
| 7 | 3 |
| 8 | -3 |
| 9 | 2 |
| 10 | 0 |
| 11 | 4 |
| 12 | -6 |
| 13 | 8 |
| 14 | -3 |
| 15 | 0 |
| 16 | 5 |
| 17 | -10 |
| 18 | 20 |
| 19 | -15 |
| 20 | 5 |
| 21 | 0 |
| 22 | 6 |
| 23 | -15 |
| 24 | 40 |
| 25 | -45 |
| 26 | 30 |
| 27 | -8 |
| 28 | 0 |
| 29 | 7 |
| 30 | -21 |
| 31 | 70 |
| 32 | -105 |
| 33 | 105 |
| 34 | -56 |
| 35 | 13 |
| 36 | 0 |
| 37 | 8 |
| 38 | -28 |
| 39 | 112 |
| 40 | -210 |
| 41 | 280 |
| 42 | -224 |
| 43 | 104 |
| 44 | -21 |
| 45 | 0 |
| 46 | 9 |
| 47 | -36 |
| 48 | 168 |
| 49 | -378 |
| 50 | 630 |
| 51 | -672 |
| 52 | 468 |
| 53 | -189 |
| 54 | 34 |
| 55 | 0 |
| 56 | 10 |
| 57 | -45 |
| 58 | 240 |
| 59 | -630 |
| 60 | 1260 |
| 61 | -1680 |
| 62 | 1560 |
| 63 | -945 |
| 64 | 340 |
| 65 | -55 |