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 | 0 |
| 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 |
| 53 | 6160 |
| 54 | -7618 |
| 55 | 9432 |
| 56 | -11665 |
| 57 | 14433 |
| 58 | -17860 |
| 59 | 22093 |
| 60 | -27341 |
| 61 | 33824 |
| 62 | -41847 |