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 | -2 |
| 2 | -3 |
| 3 | 2 |
| 4 | 4 |
| 5 | 16 |
| 6 | -3 |
| 7 | 6 |
| 8 | -31 |
| 9 | -72 |
| 10 | -15 |
| 11 | -44 |
| 12 | 9 |
| 13 | 154 |
| 14 | 521 |
| 15 | 48 |
| 16 | 426 |
| 17 | 66 |
| 18 | 2 |
| 19 | -1618 |
| 20 | -3782 |
| 21 | -210 |
| 22 | -3882 |
| 23 | -1282 |
| 24 | 1119 |
| 25 | 3940 |
| 26 | 10867 |
| 27 | 37208 |
| 28 | 11647 |
| 29 | 20574 |
| 30 | 6256 |
| 31 | 534 |
| 32 | -1915 |
| 33 | -120006 |
| 34 | -161755 |
| 35 | -312622 |
| 36 | -93923 |
| 37 | -271850 |
| 38 | -25782 |
| 39 | -197026 |
| 40 | 1112303 |
| 41 | 574604 |
| 42 | 209604 |
| 43 | 3038822 |
| 44 | 4187500 |
| 45 | 1398330 |