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 | 2 |
| 4 | -4 |
| 5 | 1 |
| 6 | -3 |
| 7 | 11 |
| 8 | -7 |
| 9 | 1 |
| 10 | 5 |
| 11 | -26 |
| 12 | 29 |
| 13 | -10 |
| 14 | 1 |
| 15 | -8 |
| 16 | 56 |
| 17 | -94 |
| 18 | 56 |
| 19 | -13 |
| 20 | 1 |
| 21 | 13 |
| 22 | -114 |
| 23 | 263 |
| 24 | -234 |
| 25 | 92 |
| 26 | -16 |
| 27 | 1 |
| 28 | -21 |
| 29 | 223 |
| 30 | -667 |
| 31 | 815 |
| 32 | -473 |
| 33 | 137 |
| 34 | -19 |
| 35 | 1 |
| 36 | 34 |
| 37 | -424 |
| 38 | 1577 |
| 39 | -2504 |
| 40 | 1982 |
| 41 | -838 |
| 42 | 191 |
| 43 | -22 |
| 44 | 1 |
| 45 | -55 |
| 46 | 789 |
| 47 | -3538 |
| 48 | 7018 |
| 49 | -7191 |
| 50 | 4115 |
| 51 | -1356 |
| 52 | 254 |
| 53 | -25 |
| 54 | 1 |
| 55 | 89 |
| 56 | -1444 |
| 57 | 7622 |
| 58 | -18336 |
| 59 | 23431 |
| 60 | -17266 |