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 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -3 |
| 9 | 1 |
| 10 | 1 |
| 11 | -1 |
| 12 | 6 |
| 13 | -10 |
| 14 | 5 |
| 15 | 0 |
| 16 | -1 |
| 17 | -15 |
| 18 | 95 |
| 19 | -40 |
| 20 | 16 |
| 21 | 239 |
| 22 | -1 |
| 23 | 13 |
| 24 | -85 |
| 25 | 240 |
| 26 | -237 |
| 27 | 79 |
| 28 | 0 |
| 29 | 403 |
| 30 | 21 |
| 31 | 385 |
| 32 | -1575 |
| 33 | 3577 |
| 34 | -2947 |
| 35 | 421 |
| 36 | -46409 |
| 37 | -239 |
| 38 | 3841 |
| 39 | 175 |
| 40 | 861 |
| 41 | -8036 |
| 42 | 45458 |
| 43 | -10692 |
| 44 | 2673 |
| 45 | 0 |
| 46 | -82451 |
| 47 | -2657 |
| 48 | 56177 |
| 49 | 1638 |
| 50 | 19488 |
| 51 | -85260 |
| 52 | 139656 |
| 53 | -86472 |
| 54 | 19216 |