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 | 2 |
| 4 | 5 |
| 5 | 3 |
| 6 | 0 |
| 7 | -4 |
| 8 | 0 |
| 9 | 5 |
| 10 | 11 |
| 11 | 18 |
| 12 | 12 |
| 13 | 7 |
| 14 | 0 |
| 15 | -8 |
| 16 | -17 |
| 17 | -27 |
| 18 | -16 |
| 19 | -8 |
| 20 | 1 |
| 21 | 11 |
| 22 | 0 |
| 23 | -12 |
| 24 | -25 |
| 25 | -39 |
| 26 | -54 |
| 27 | -70 |
| 28 | -87 |
| 29 | -70 |
| 30 | -58 |
| 31 | -45 |
| 32 | -31 |
| 33 | -16 |
| 34 | 0 |
| 35 | 18 |
| 36 | 37 |
| 37 | 57 |
| 38 | 78 |
| 39 | 100 |
| 40 | 123 |
| 41 | 147 |
| 42 | 172 |
| 43 | 198 |
| 44 | 225 |
| 45 | 253 |
| 46 | 226 |
| 47 | 207 |
| 48 | 189 |
| 49 | 169 |
| 50 | 148 |
| 51 | 126 |
| 52 | 103 |
| 53 | 79 |
| 54 | 54 |
| 55 | 28 |
| 56 | 0 |
| 57 | -29 |
| 58 | -59 |
| 59 | -90 |
| 60 | -122 |
| 61 | -155 |