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 | 1 |
| 3 | 2 |
| 4 | -23 |
| 5 | -48 |
| 6 | 212 |
| 7 | 1037 |
| 8 | 1928 |
| 9 | -222 |
| 10 | -33722 |
| 11 | -87856 |
| 12 | 62366 |
| 13 | 599582 |
| 14 | -875575 |
| 15 | -3216373 |
| 16 | -3195437 |
| 17 | -21830254 |
| 18 | -46758740 |
| 19 | 899990187 |
| 20 | 461113106 |
| 21 | -3395895277 |
| 22 | -2061910120 |
| 23 | 62467771689 |