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 | 4 |
| 2 | -6 |
| 3 | 4 |
| 4 | -1 |
| 5 | 22 |
| 6 | -80 |
| 7 | 139 |
| 8 | -140 |
| 9 | 84 |
| 10 | -28 |
| 11 | 4 |
| 12 | 140 |
| 13 | -851 |
| 14 | 2500 |
| 15 | -4536 |
| 16 | 5516 |
| 17 | -4616 |
| 18 | 2640 |
| 19 | -990 |
| 20 | 220 |
| 21 | -22 |
| 22 | 969 |
| 23 | -8420 |
| 24 | 35504 |
| 25 | -94584 |
| 26 | 175564 |
| 27 | -237600 |
| 28 | 239250 |
| 29 | -179960 |
| 30 | 100078 |
| 31 | -40040 |
| 32 | 10920 |
| 33 | -1820 |
| 34 | 140 |
| 35 | 7084 |
| 36 | -80776 |
| 37 | 448056 |