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 | 0 |
| 5 | 0 |
| 6 | -3 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | -3 |
| 12 | 5 |
| 13 | 0 |
| 14 | -3 |
| 15 | 7 |
| 16 | 0 |
| 17 | 12 |
| 18 | -7 |
| 19 | -3 |
| 20 | 21 |
| 21 | -14 |
| 22 | 3 |
| 23 | -6 |
| 24 | 6 |
| 25 | 27 |
| 26 | -57 |
| 27 | 22 |
| 28 | 6 |
| 29 | -36 |
| 30 | 15 |
| 31 | -75 |
| 32 | 87 |
| 33 | -17 |
| 34 | -111 |
| 35 | 99 |
| 36 | -71 |
| 37 | 75 |
| 38 | -90 |
| 39 | -91 |
| 40 | 324 |
| 41 | -225 |
| 42 | 23 |
| 43 | 57 |
| 44 | -36 |
| 45 | 332 |
| 46 | -543 |
| 47 | 333 |
| 48 | 374 |
| 49 | -417 |
| 50 | 342 |
| 51 | -473 |
| 52 | 720 |
| 53 | 18 |
| 54 | -1132 |
| 55 | 1227 |
| 56 | -330 |
| 57 | 202 |
| 58 | -414 |
| 59 | -846 |
| 60 | 2357 |
| 61 | -1998 |