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 | -1 |
| 2 | 0 |
| 3 | 2 |
| 4 | -2 |
| 5 | -5 |
| 6 | 14 |
| 7 | 5 |
| 8 | -72 |
| 9 | 68 |
| 10 | 278 |
| 11 | -726 |
| 12 | -520 |
| 13 | 4691 |
| 14 | -3514 |
| 15 | -21758 |
| 16 | 50374 |
| 17 | 56185 |
| 18 | -374566 |
| 19 | 194596 |
| 20 | 1962618 |
| 21 | -3956504 |
| 22 | -6258320 |
| 23 | 33057877 |
| 24 | -8974630 |
| 25 | -190822072 |
| 26 | 330170022 |
| 27 | 710487590 |
| 28 | -3088268200 |
| 29 | 18008739 |
| 30 | 19398384974 |
| 31 | -28292606291 |
| 32 | -81631282280 |
| 33 | 298546543220 |
| 34 | 84094857302 |
| 35 | -2028216574806 |
| 36 | 2428288153424 |
| 37 | 9450205225145 |