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 | -11 |
| 8 | 27 |
| 9 | -1 |
| 10 | 1 |
| 11 | -16 |
| 12 | 78 |
| 13 | -112 |
| 14 | 1 |
| 15 | 1 |
| 16 | -21 |
| 17 | 154 |
| 18 | -458 |
| 19 | 453 |
| 20 | -1 |
| 21 | 1 |
| 22 | -26 |
| 23 | 255 |
| 24 | -1164 |
| 25 | 2431 |
| 26 | -1818 |
| 27 | 1 |
| 28 | 1 |
| 29 | -31 |
| 30 | 381 |
| 31 | -2355 |
| 32 | 7635 |
| 33 | -12141 |
| 34 | 7279 |
| 35 | -1 |
| 36 | 1 |
| 37 | -36 |
| 38 | 532 |
| 39 | -4156 |
| 40 | 18390 |
| 41 | -45660 |
| 42 | 58260 |
| 43 | -29124 |
| 44 | 1 |
| 45 | 1 |
| 46 | -41 |
| 47 | 708 |
| 48 | -6692 |
| 49 | 37646 |
| 50 | -128190 |