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 | -8 |
| 2 | 12 |
| 3 | -6 |
| 4 | 1 |
| 5 | 27 |
| 6 | -108 |
| 7 | 171 |
| 8 | -136 |
| 9 | 57 |
| 10 | -12 |
| 11 | 1 |
| 12 | -64 |
| 13 | 480 |
| 14 | -1488 |
| 15 | 2488 |
| 16 | -2472 |
| 17 | 1524 |
| 18 | -588 |
| 19 | 138 |
| 20 | -18 |
| 21 | 1 |
| 22 | 125 |
| 23 | -1500 |
| 24 | 7575 |
| 25 | -21200 |
| 26 | 36690 |
| 27 | -41700 |
| 28 | 32211 |
| 29 | -17184 |
| 30 | 6330 |
| 31 | -1580 |
| 32 | 255 |
| 33 | -24 |
| 34 | 1 |
| 35 | -216 |
| 36 | 3780 |
| 37 | -28098 |
| 38 | 117323 |
| 39 | -308688 |
| 40 | 546864 |
| 41 | -680474 |
| 42 | 611019 |
| 43 | -402264 |
| 44 | 195444 |
| 45 | -69894 |
| 46 | 18153 |
| 47 | -3328 |
| 48 | 408 |
| 49 | -30 |
| 50 | 1 |