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 | -6 |
| 3 | -4 |
| 4 | 22 |
| 5 | 72 |
| 6 | 84 |
| 7 | -32 |
| 8 | -474 |
| 9 | -1310 |
| 10 | -1728 |
| 11 | 60 |
| 12 | 6420 |
| 13 | 18712 |
| 14 | 31080 |
| 15 | 24992 |
| 16 | -34074 |
| 17 | -186468 |
| 18 | -430138 |
| 19 | -650612 |
| 20 | -496296 |
| 21 | 687120 |
| 22 | 3599652 |
| 23 | 8413968 |
| 24 | 13374148 |
| 25 | 12772246 |
| 26 | -3910080 |
| 27 | -50592280 |
| 28 | -136089520 |
| 29 | -244815336 |
| 30 | -309079848 |
| 31 | -176916784 |
| 32 | 391358838 |