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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | -1 |
| 5 | 0 |
| 6 | 3 |
| 7 | -4 |
| 8 | -3 |
| 9 | 8 |
| 10 | -7 |
| 11 | -10 |
| 12 | 23 |
| 13 | -8 |
| 14 | -33 |
| 15 | 56 |
| 16 | 1 |
| 17 | -104 |
| 18 | 121 |
| 19 | 58 |
| 20 | -297 |
| 21 | 232 |
| 22 | 291 |
| 23 | -780 |
| 24 | 349 |
| 25 | 1072 |
| 26 | -1903 |
| 27 | 174 |
| 28 | 3407 |
| 29 | -4272 |
| 30 | -1505 |
| 31 | 9840 |
| 32 | -8543 |
| 33 | -8752 |
| 34 | 26321 |
| 35 | -13902 |
| 36 | -33777 |
| 37 | 65456 |
| 38 | -11805 |
| 39 | -110356 |
| 40 | 150173 |
| 41 | 35192 |
| 42 | -325303 |
| 43 | 310054 |
| 44 | 257319 |
| 45 | -885496 |
| 46 | 537919 |
| 47 | 1054888 |
| 48 | -2240927 |