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 | 2 |
| 3 | -1 |
| 4 | 1 |
| 5 | -3 |
| 6 | 3 |
| 7 | -3 |
| 8 | 4 |
| 9 | -4 |
| 10 | 6 |
| 11 | -6 |
| 12 | 5 |
| 13 | -9 |
| 14 | 11 |
| 15 | -10 |
| 16 | 11 |
| 17 | -15 |
| 18 | 17 |
| 19 | -16 |
| 20 | 19 |
| 21 | -22 |
| 22 | 26 |
| 23 | -29 |
| 24 | 29 |
| 25 | -36 |
| 26 | 42 |
| 27 | -42 |
| 28 | 46 |
| 29 | -55 |
| 30 | 60 |
| 31 | -64 |
| 32 | 71 |
| 33 | -79 |
| 34 | 90 |
| 35 | -95 |
| 36 | 101 |
| 37 | -117 |
| 38 | 131 |
| 39 | -137 |
| 40 | 148 |
| 41 | -169 |
| 42 | 184 |
| 43 | -195 |
| 44 | 211 |
| 45 | -234 |
| 46 | 258 |
| 47 | -276 |
| 48 | 295 |
| 49 | -327 |
| 50 | 360 |
| 51 | -379 |
| 52 | 409 |
| 53 | -453 |
| 54 | 489 |
| 55 | -522 |
| 56 | 563 |
| 57 | -612 |
| 58 | 666 |
| 59 | -710 |
| 60 | 757 |
| 61 | -829 |
| 62 | 898 |