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 | -3 |
| 2 | 6 |
| 3 | -6 |
| 4 | 0 |
| 5 | 12 |
| 6 | -24 |
| 7 | 27 |
| 8 | -15 |
| 9 | -12 |
| 10 | 48 |
| 11 | -81 |
| 12 | 90 |
| 13 | -54 |
| 14 | -36 |
| 15 | 159 |
| 16 | -258 |
| 17 | 267 |
| 18 | -138 |
| 19 | -123 |
| 20 | 441 |
| 21 | -684 |
| 22 | 693 |
| 23 | -354 |
| 24 | -318 |
| 25 | 1122 |
| 26 | -1701 |
| 27 | 1668 |
| 28 | -801 |
| 29 | -792 |
| 30 | 2616 |
| 31 | -3876 |
| 32 | 3753 |
| 33 | -1782 |
| 34 | -1776 |
| 35 | 5778 |
| 36 | -8451 |
| 37 | 8046 |
| 38 | -3705 |
| 39 | -3843 |
| 40 | 12120 |
| 41 | -17496 |
| 42 | 16506 |
| 43 | -7524 |
| 44 | -7848 |
| 45 | 24483 |