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 | 1 |
| 4 | 3 |
| 5 | 18 |
| 6 | 0 |
| 7 | 35 |
| 8 | -27 |
| 9 | -85 |
| 10 | -91 |
| 11 | -109 |
| 12 | -366 |
| 13 | 118 |
| 14 | 942 |
| 15 | -957 |
| 16 | 2791 |
| 17 | 2091 |
| 18 | 4855 |
| 19 | -1157 |
| 20 | -6903 |
| 21 | 3341 |
| 22 | 3162 |
| 23 | -37034 |
| 24 | -46480 |
| 25 | -89890 |
| 26 | 581 |
| 27 | 131275 |
| 28 | -296935 |
| 29 | 167543 |
| 30 | 108671 |
| 31 | 801491 |
| 32 | 616017 |
| 33 | 2441581 |
| 34 | -307733 |
| 35 | -1864550 |
| 36 | 4495872 |
| 37 | 1158228 |
| 38 | -2589768 |
| 39 | -767646 |
| 40 | -21062537 |