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 | -2 |
| 3 | 3 |
| 4 | 2 |
| 5 | -41 |
| 6 | 196 |
| 7 | -541 |
| 8 | 229 |
| 9 | 7235 |
| 10 | -48228 |
| 11 | 175956 |
| 12 | -254933 |
| 13 | -1575661 |
| 14 | 14909191 |
| 15 | -67194669 |
| 16 | 153944915 |
| 17 | 292516673 |
| 18 | -4968647665 |
| 19 | 27275432639 |
| 20 | -82747735226 |
| 21 | 3883854725 |
| 22 | 1660136515050 |
| 23 | -11302429310683 |
| 24 | 42362000190568 |
| 25 | -53376259124482 |
| 26 | -520085199830413 |
| 27 | 4671353423344131 |