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 | -31 |
| 3 | -242 |
| 4 | -31 |
| 5 | -3124 |
| 6 | 7502 |
| 7 | -16806 |
| 8 | -31 |
| 9 | -242 |
| 10 | 96844 |
| 11 | -161050 |
| 12 | 7502 |
| 13 | -371292 |
| 14 | 520986 |
| 15 | 756008 |
| 16 | -31 |
| 17 | -1419856 |
| 18 | 7502 |
| 19 | -2476098 |
| 20 | 96844 |
| 21 | 4067052 |
| 22 | 4992550 |
| 23 | -6436342 |
| 24 | 7502 |
| 25 | -3124 |
| 26 | 11510052 |
| 27 | -242 |
| 28 | 520986 |
| 29 | -20511148 |
| 30 | -23436248 |