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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | -2 |
| 7 | 2 |
| 8 | -3 |
| 9 | 4 |
| 10 | -5 |
| 11 | 4 |
| 12 | -5 |
| 13 | 8 |
| 14 | -9 |
| 15 | 7 |
| 16 | -9 |
| 17 | 13 |
| 18 | -14 |
| 19 | 12 |
| 20 | -13 |
| 21 | 18 |
| 22 | -21 |
| 23 | 17 |
| 24 | -18 |
| 25 | 29 |
| 26 | -31 |
| 27 | 23 |
| 28 | -28 |
| 29 | 36 |
| 30 | -37 |
| 31 | 36 |
| 32 | -37 |
| 33 | 50 |
| 34 | -55 |
| 35 | 42 |
| 36 | -46 |
| 37 | 64 |
| 38 | -65 |
| 39 | 53 |
| 40 | -62 |
| 41 | 83 |
| 42 | -84 |
| 43 | 75 |
| 44 | -76 |
| 45 | 94 |
| 46 | -107 |
| 47 | 90 |
| 48 | -91 |
| 49 | 129 |
| 50 | -132 |
| 51 | 107 |
| 52 | -121 |
| 53 | 145 |
| 54 | -146 |
| 55 | 135 |
| 56 | -141 |
| 57 | 180 |
| 58 | -193 |
| 59 | 157 |