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 | 0 |
| 1 | 1 |
| 2 | -6 |
| 3 | 9 |
| 4 | 4 |
| 5 | 6 |
| 6 | -54 |
| 7 | -40 |
| 8 | 168 |
| 9 | 81 |
| 10 | -36 |
| 11 | -564 |
| 12 | 36 |
| 13 | 638 |
| 14 | 240 |
| 15 | 54 |
| 16 | -1136 |
| 17 | 882 |
| 18 | -486 |
| 19 | -556 |
| 20 | 24 |
| 21 | -360 |
| 22 | 3384 |
| 23 | -840 |
| 24 | 1512 |
| 25 | -3089 |
| 26 | -3828 |
| 27 | 729 |
| 28 | -160 |
| 29 | 4638 |
| 30 | -324 |
| 31 | 4400 |
| 32 | 1440 |
| 33 | -5076 |
| 34 | -5292 |
| 35 | -240 |
| 36 | 324 |
| 37 | -2410 |
| 38 | 3336 |
| 39 | 5742 |
| 40 | 1008 |
| 41 | -6870 |
| 42 | 2160 |
| 43 | 9644 |
| 44 | -2256 |
| 45 | 486 |
| 46 | 5040 |