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 | 1 |
| 6 | -1 |
| 7 | 1 |
| 8 | 0 |
| 9 | -2 |
| 10 | 4 |
| 11 | -4 |
| 12 | 1 |
| 13 | 3 |
| 14 | -5 |
| 15 | 4 |
| 16 | -3 |
| 17 | 3 |
| 18 | -1 |
| 19 | -6 |
| 20 | 13 |
| 21 | -12 |
| 22 | 2 |
| 23 | 9 |
| 24 | -13 |
| 25 | 10 |
| 26 | -6 |
| 27 | 6 |
| 28 | -4 |
| 29 | -9 |
| 30 | 28 |
| 31 | -30 |
| 32 | 5 |
| 33 | 25 |
| 34 | -28 |
| 35 | 5 |
| 36 | 9 |
| 37 | 7 |
| 38 | -27 |
| 39 | 11 |
| 40 | 32 |
| 41 | -47 |
| 42 | 2 |
| 43 | 51 |
| 44 | -27 |
| 45 | -74 |
| 46 | 128 |
| 47 | -34 |
| 48 | -131 |
| 49 | 183 |
| 50 | -78 |
| 51 | -15 |
| 52 | -37 |
| 53 | 97 |
| 54 | 89 |
| 55 | -480 |
| 56 | 649 |
| 57 | -242 |
| 58 | -498 |
| 59 | 904 |
| 60 | -663 |
| 61 | 223 |
| 62 | -140 |
| 63 | 169 |
| 64 | 488 |
| 65 | -1818 |