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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 4 |
| 6 | -5 |
| 7 | 6 |
| 8 | 4 |
| 9 | 6 |
| 10 | -9 |
| 11 | 10 |
| 12 | -11 |
| 13 | 12 |
| 14 | -13 |
| 15 | -14 |
| 16 | 8 |
| 17 | 16 |
| 18 | -17 |
| 19 | 18 |
| 20 | -19 |
| 21 | -20 |
| 22 | -21 |
| 23 | 22 |
| 24 | -23 |
| 25 | 20 |
| 26 | -25 |
| 27 | 18 |
| 28 | -27 |
| 29 | 28 |
| 30 | -29 |
| 31 | 30 |
| 32 | 16 |
| 33 | -32 |
| 34 | -33 |
| 35 | -34 |
| 36 | -35 |
| 37 | 36 |
| 38 | -37 |
| 39 | -38 |
| 40 | -39 |
| 41 | 40 |
| 42 | -41 |
| 43 | 42 |
| 44 | -43 |
| 45 | -44 |
| 46 | -45 |
| 47 | 46 |
| 48 | -47 |
| 49 | 42 |
| 50 | -49 |
| 51 | -50 |
| 52 | -51 |
| 53 | 52 |
| 54 | -53 |
| 55 | -54 |
| 56 | -55 |
| 57 | -56 |
| 58 | -57 |
| 59 | 58 |
| 60 | -59 |
| 61 | 60 |
| 62 | -61 |
| 63 | -62 |
| 64 | 32 |
| 65 | -64 |
| 66 | -65 |
| 67 | 66 |
| 68 | -67 |
| 69 | -68 |
| 70 | -69 |
| 71 | 70 |
| 72 | -71 |
| 73 | 72 |
| 74 | -73 |