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 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | -2 |
| 10 | 1 |
| 11 | 0 |
| 12 | -1 |
| 13 | 3 |
| 14 | -3 |
| 15 | 1 |
| 16 | 1 |
| 17 | -4 |
| 18 | 6 |
| 19 | -4 |
| 20 | 0 |
| 21 | 5 |
| 22 | -10 |
| 23 | 10 |
| 24 | -4 |
| 25 | -5 |
| 26 | 15 |
| 27 | -20 |
| 28 | 14 |
| 29 | 1 |
| 30 | -20 |
| 31 | 35 |
| 32 | -34 |
| 33 | 13 |
| 34 | 21 |
| 35 | -55 |
| 36 | 69 |
| 37 | -47 |
| 38 | -8 |
| 39 | 76 |
| 40 | -124 |
| 41 | 116 |
| 42 | -39 |
| 43 | -84 |
| 44 | 200 |
| 45 | -240 |
| 46 | 155 |
| 47 | 45 |
| 48 | -284 |
| 49 | 440 |
| 50 | -395 |
| 51 | 110 |
| 52 | 329 |
| 53 | -724 |
| 54 | 835 |
| 55 | -505 |
| 56 | -219 |
| 57 | 1053 |
| 58 | -1559 |
| 59 | 1340 |