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 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -3 |
| 9 | 1 |
| 10 | 0 |
| 11 | 0 |
| 12 | 7 |
| 13 | -6 |
| 14 | 1 |
| 15 | 0 |
| 16 | -5 |
| 17 | -10 |
| 18 | 25 |
| 19 | -10 |
| 20 | 1 |
| 21 | 0 |
| 22 | 18 |
| 23 | -20 |
| 24 | -75 |
| 25 | 65 |
| 26 | -15 |
| 27 | 1 |
| 28 | 0 |
| 29 | -7 |
| 30 | 231 |
| 31 | 70 |
| 32 | -315 |
| 33 | 140 |
| 34 | -21 |
| 35 | 1 |
| 36 | 0 |
| 37 | -338 |
| 38 | -840 |
| 39 | 1064 |
| 40 | 945 |
| 41 | -980 |
| 42 | 266 |
| 43 | -28 |
| 44 | 1 |
| 45 | 0 |
| 46 | 2215 |
| 47 | -1278 |
| 48 | -8918 |
| 49 | 1512 |
| 50 | 4935 |
| 51 | -2520 |
| 52 | 462 |
| 53 | -36 |
| 54 | 1 |