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 | 0 |
| 2 | -1 |
| 3 | -1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 0 |
| 7 | -3 |
| 8 | -2 |
| 9 | 3 |
| 10 | 5 |
| 11 | -1 |
| 12 | -8 |
| 13 | -4 |
| 14 | 9 |
| 15 | 12 |
| 16 | -5 |
| 17 | -21 |
| 18 | -7 |
| 19 | 26 |
| 20 | 28 |
| 21 | -19 |
| 22 | -54 |
| 23 | -9 |
| 24 | 73 |
| 25 | 63 |
| 26 | -64 |
| 27 | -136 |
| 28 | 1 |
| 29 | 200 |
| 30 | 135 |
| 31 | -201 |
| 32 | -335 |
| 33 | 66 |
| 34 | 536 |
| 35 | 269 |
| 36 | -602 |
| 37 | -805 |
| 38 | 333 |
| 39 | 1407 |
| 40 | 472 |
| 41 | -1740 |
| 42 | -1879 |
| 43 | 1268 |
| 44 | 3619 |
| 45 | 611 |
| 46 | -4887 |
| 47 | -4230 |
| 48 | 4276 |
| 49 | 9117 |
| 50 | -46 |
| 51 | -13393 |
| 52 | -9071 |
| 53 | 13439 |
| 54 | 22464 |
| 55 | -4368 |
| 56 | -35903 |
| 57 | -18096 |
| 58 | 40271 |
| 59 | 53999 |