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 | -1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 2 |
| 7 | -2 |
| 8 | -7 |
| 9 | -6 |
| 10 | 4 |
| 11 | 16 |
| 12 | 14 |
| 13 | -9 |
| 14 | -37 |
| 15 | -33 |
| 16 | 20 |
| 17 | 87 |
| 18 | 82 |
| 19 | -41 |
| 20 | -201 |
| 21 | -198 |
| 22 | 85 |
| 23 | 465 |
| 24 | 475 |
| 25 | -178 |
| 26 | -1084 |
| 27 | -1150 |
| 28 | 353 |
| 29 | 2511 |
| 30 | 2767 |
| 31 | -684 |
| 32 | -5810 |
| 33 | -6633 |
| 34 | 1287 |
| 35 | 13463 |
| 36 | 15923 |
| 37 | -2222 |
| 38 | -31119 |
| 39 | -38130 |
| 40 | 3356 |
| 41 | 71838 |
| 42 | 91138 |
| 43 | -3595 |
| 44 | -165763 |
| 45 | -217705 |
| 46 | -1761 |
| 47 | 381895 |
| 48 | 519284 |
| 49 | 27984 |
| 50 | -878685 |