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 | 1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 0 |
| 6 | 2 |
| 7 | -2 |
| 8 | -1 |
| 9 | 4 |
| 10 | -1 |
| 11 | -4 |
| 12 | 4 |
| 13 | 1 |
| 14 | -6 |
| 15 | 3 |
| 16 | 6 |
| 17 | -7 |
| 18 | -3 |
| 19 | 10 |
| 20 | -4 |
| 21 | -10 |
| 22 | 12 |
| 23 | 6 |
| 24 | -18 |
| 25 | 5 |
| 26 | 18 |
| 27 | -20 |
| 28 | -8 |
| 29 | 30 |
| 30 | -10 |
| 31 | -29 |
| 32 | 31 |
| 33 | 12 |
| 34 | -46 |
| 35 | 17 |
| 36 | 44 |
| 37 | -47 |
| 38 | -20 |
| 39 | 68 |
| 40 | -23 |
| 41 | -66 |
| 42 | 72 |
| 43 | 31 |
| 44 | -104 |
| 45 | 33 |
| 46 | 98 |
| 47 | -107 |
| 48 | -44 |
| 49 | 156 |
| 50 | -51 |
| 51 | -144 |
| 52 | 154 |
| 53 | 61 |
| 54 | -220 |
| 55 | 75 |
| 56 | 206 |
| 57 | -220 |
| 58 | -90 |
| 59 | 310 |
| 60 | -104 |
| 61 | -290 |
| 62 | 312 |
| 63 | 131 |
| 64 | -442 |
| 65 | 143 |
| 66 | 408 |
| 67 | -437 |
| 68 | -178 |
| 69 | 618 |
| 70 | -202 |