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 | -1 |
| 3 | 4 |
| 4 | -4 |
| 5 | 9 |
| 6 | -5 |
| 7 | 12 |
| 8 | -12 |
| 9 | 17 |
| 10 | -15 |
| 11 | 24 |
| 12 | -16 |
| 13 | 29 |
| 14 | -17 |
| 15 | 32 |
| 16 | -32 |
| 17 | 37 |
| 18 | -35 |
| 19 | 44 |
| 20 | -38 |
| 21 | 53 |
| 22 | -43 |
| 23 | 60 |
| 24 | -44 |
| 25 | 65 |
| 26 | -47 |
| 27 | 72 |
| 28 | -48 |
| 29 | 77 |
| 30 | -49 |
| 31 | 80 |
| 32 | -80 |
| 33 | 85 |
| 34 | -83 |
| 35 | 92 |
| 36 | -86 |
| 37 | 101 |
| 38 | -91 |
| 39 | 108 |
| 40 | -94 |
| 41 | 117 |
| 42 | -101 |
| 43 | 128 |
| 44 | -106 |
| 45 | 137 |
| 46 | -111 |
| 47 | 144 |
| 48 | -112 |
| 49 | 149 |
| 50 | -115 |
| 51 | 156 |
| 52 | -118 |
| 53 | 165 |
| 54 | -123 |
| 55 | 172 |