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 | -31 |
| 3 | -212 |
| 4 | -284 |
| 5 | 4935 |
| 6 | 43719 |
| 7 | 160002 |
| 8 | -96747 |
| 9 | -4914512 |
| 10 | -31358932 |
| 11 | -94515285 |
| 12 | 97642670 |
| 13 | 2823746182 |
| 14 | 16834776254 |
| 15 | 51617810512 |
| 16 | -11233909783 |
| 17 | -1137004349695 |
| 18 | -7267899354808 |
| 19 | -25263858110877 |
| 20 | -24537905293857 |
| 21 | 319397811973578 |
| 22 | 2523465326904492 |