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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 2 |
| 5 | 25 |
| 6 | 9 |
| 7 | 49 |
| 8 | -464 |
| 9 | 27 |
| 10 | -16175 |
| 11 | -3237113 |
| 12 | -105387 |
| 13 | -1737125143 |
| 14 | -770720657 |
| 15 | -25881785 |
| 16 | -1997012608 |
| 17 | -135505859252213 |
| 18 | -214182958293 |
| 19 | -528114253960241 |
| 20 | -19467909708875 |
| 21 | -595278405326437 |
| 22 | -66462260889140083 |
| 23 | -180690496141440384775397 |
| 24 | -1610254561193224 |