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 | 3 |
| 5 | -2 |
| 6 | -5 |
| 7 | 7 |
| 8 | 4 |
| 9 | -9 |
| 10 | 6 |
| 11 | -6 |
| 12 | 15 |
| 13 | -8 |
| 14 | -17 |
| 15 | 19 |
| 16 | -21 |
| 17 | 12 |
| 18 | -12 |
| 19 | 27 |
| 20 | -14 |
| 21 | -29 |
| 22 | 16 |
| 23 | -33 |
| 24 | 18 |
| 25 | 39 |
| 26 | -20 |
| 27 | -41 |
| 28 | 43 |
| 29 | 22 |
| 30 | -45 |
| 31 | 51 |
| 32 | -26 |
| 33 | 55 |
| 34 | 28 |
| 35 | 30 |
| 36 | -30 |
| 37 | 63 |
| 38 | -65 |
| 39 | 67 |
| 40 | -69 |
| 41 | 36 |
| 42 | -36 |
| 43 | -38 |
| 44 | -77 |
| 45 | 79 |
| 46 | 40 |
| 47 | -42 |
| 48 | -89 |
| 49 | 91 |
| 50 | 46 |
| 51 | -93 |
| 52 | 48 |
| 53 | -48 |
| 54 | -50 |
| 55 | 103 |
| 56 | -105 |
| 57 | 54 |
| 58 | -54 |
| 59 | 111 |
| 60 | -56 |
| 61 | -113 |
| 62 | -117 |
| 63 | 123 |
| 64 | -62 |