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) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | 3 |
| 4 | 5 |
| 5 | -18 |
| 6 | 15 |
| 7 | 24 |
| 8 | -75 |
| 9 | 57 |
| 10 | 86 |
| 11 | -252 |
| 12 | 183 |
| 13 | 262 |
| 14 | -744 |
| 15 | 522 |
| 16 | 725 |
| 17 | -1998 |
| 18 | 1365 |
| 19 | 1852 |
| 20 | -4986 |
| 21 | 3336 |
| 22 | 4436 |
| 23 | -11736 |
| 24 | 7719 |
| 25 | 10103 |
| 26 | -26322 |
| 27 | 17067 |
| 28 | 22040 |
| 29 | -56682 |
| 30 | 36306 |
| 31 | 46336 |
| 32 | -117867 |
| 33 | 74700 |
| 34 | 94378 |
| 35 | -237744 |
| 36 | 149277 |
| 37 | 186926 |
| 38 | -466836 |
| 39 | 290706 |
| 40 | 361126 |
| 41 | -895014 |
| 42 | 553224 |