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 | -3 |
| 2 | 4 |
| 3 | 5 |
| 4 | -20 |
| 5 | 16 |
| 6 | -7 |
| 7 | 56 |
| 8 | -112 |
| 9 | 64 |
| 10 | 9 |
| 11 | -120 |
| 12 | 432 |
| 13 | -576 |
| 14 | 256 |
| 15 | -11 |
| 16 | 220 |
| 17 | -1232 |
| 18 | 2816 |
| 19 | -2816 |
| 20 | 1024 |
| 21 | 13 |
| 22 | -364 |
| 23 | 2912 |
| 24 | -9984 |
| 25 | 16640 |
| 26 | -13312 |
| 27 | 4096 |
| 28 | -15 |
| 29 | 560 |
| 30 | -6048 |
| 31 | 28800 |
| 32 | -70400 |
| 33 | 92160 |
| 34 | -61440 |
| 35 | 16384 |
| 36 | 17 |
| 37 | -816 |
| 38 | 11424 |
| 39 | -71808 |
| 40 | 239360 |
| 41 | -452608 |
| 42 | 487424 |
| 43 | -278528 |
| 44 | 65536 |
| 45 | -19 |
| 46 | 1140 |
| 47 | -20064 |
| 48 | 160512 |
| 49 | -695552 |