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 | 2 |
| 2 | -1 |
| 3 | -6 |
| 4 | 7 |
| 5 | 42 |
| 6 | -58 |
| 7 | -366 |
| 8 | 513 |
| 9 | 3406 |
| 10 | -4846 |
| 11 | -33310 |
| 12 | 48304 |
| 13 | 339446 |
| 14 | -499133 |
| 15 | -3565468 |
| 16 | 5294439 |
| 17 | 38312242 |
| 18 | -57332347 |
| 19 | -419177900 |
| 20 | 631252549 |
| 21 | 4654229300 |
| 22 | -7045498256 |
| 23 | -52310262192 |
| 24 | 79531957334 |
| 25 | 593986308994 |
| 26 | -906439292326 |
| 27 | -6803984285256 |