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 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | 3 |
| 4 | -2 |
| 5 | 1 |
| 6 | 4 |
| 7 | -6 |
| 8 | 3 |
| 9 | -1 |
| 10 | 7 |
| 11 | -12 |
| 12 | 10 |
| 13 | -4 |
| 14 | 1 |
| 15 | 11 |
| 16 | -25 |
| 17 | 25 |
| 18 | -15 |
| 19 | 5 |
| 20 | -1 |
| 21 | 18 |
| 22 | -48 |
| 23 | 60 |
| 24 | -44 |
| 25 | 21 |
| 26 | -6 |
| 27 | 1 |
| 28 | 29 |
| 29 | -91 |
| 30 | 133 |
| 31 | -119 |
| 32 | 70 |
| 33 | -28 |
| 34 | 7 |
| 35 | -1 |
| 36 | 47 |
| 37 | -168 |
| 38 | 284 |
| 39 | -296 |
| 40 | 210 |
| 41 | -104 |
| 42 | 36 |
| 43 | -8 |
| 44 | 1 |
| 45 | 76 |
| 46 | -306 |
| 47 | 585 |
| 48 | -699 |
| 49 | 576 |
| 50 | -342 |
| 51 | 147 |
| 52 | -45 |
| 53 | 9 |
| 54 | -1 |
| 55 | 123 |
| 56 | -550 |
| 57 | 1175 |
| 58 | -1580 |
| 59 | 1485 |
| 60 | -1022 |
| 61 | 525 |
| 62 | -200 |
| 63 | 55 |
| 64 | -10 |
| 65 | 1 |
| 66 | 199 |
| 67 | -979 |
| 68 | 2310 |
| 69 | -3454 |
| 70 | 3641 |