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 | -1 |
| 2 | 0 |
| 3 | 0 |
| 4 | -1 |
| 5 | 0 |
| 6 | 0 |
| 7 | -1 |
| 8 | 0 |
| 9 | -1 |
| 10 | -1 |
| 11 | 0 |
| 12 | -2 |
| 13 | -1 |
| 14 | -1 |
| 15 | -3 |
| 16 | -2 |
| 17 | -3 |
| 18 | -4 |
| 19 | -4 |
| 20 | -6 |
| 21 | -7 |
| 22 | -8 |
| 23 | -11 |
| 24 | -13 |
| 25 | -16 |
| 26 | -20 |
| 27 | -24 |
| 28 | -31 |
| 29 | -37 |
| 30 | -46 |
| 31 | -58 |
| 32 | -70 |
| 33 | -88 |
| 34 | -108 |
| 35 | -133 |
| 36 | -167 |
| 37 | -204 |
| 38 | -252 |
| 39 | -315 |
| 40 | -386 |
| 41 | -479 |
| 42 | -594 |
| 43 | -731 |
| 44 | -909 |
| 45 | -1122 |
| 46 | -1386 |
| 47 | -1720 |
| 48 | -2124 |
| 49 | -2628 |
| 50 | -3254 |
| 51 | -4022 |
| 52 | -4980 |