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 | 1 |
| 4 | -6 |
| 5 | 1 |
| 6 | 1 |
| 7 | -12 |
| 8 | 20 |
| 9 | -1 |
| 10 | 1 |
| 11 | -19 |
| 12 | 69 |
| 13 | -59 |
| 14 | 1 |
| 15 | 1 |
| 16 | -27 |
| 17 | 159 |
| 18 | -303 |
| 19 | 162 |
| 20 | -1 |
| 21 | 1 |
| 22 | -36 |
| 23 | 302 |
| 24 | -943 |
| 25 | 1149 |
| 26 | -434 |
| 27 | 1 |
| 28 | 1 |
| 29 | -46 |
| 30 | 511 |
| 31 | -2284 |
| 32 | 4599 |
| 33 | -3991 |
| 34 | 1147 |
| 35 | -1 |
| 36 | 1 |
| 37 | -57 |
| 38 | 800 |
| 39 | -4743 |
| 40 | 13733 |
| 41 | -19785 |
| 42 | 13090 |
| 43 | -3016 |
| 44 | 1 |
| 45 | 1 |
| 46 | -69 |
| 47 | 1184 |
| 48 | -8867 |
| 49 | 34141 |
| 50 | -70945 |