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 | -2 |
| 3 | 16 |
| 4 | -16 |
| 5 | 3 |
| 6 | 64 |
| 7 | -96 |
| 8 | 40 |
| 9 | -4 |
| 10 | 256 |
| 11 | -512 |
| 12 | 336 |
| 13 | -80 |
| 14 | 5 |
| 15 | 1024 |
| 16 | -2560 |
| 17 | 2304 |
| 18 | -896 |
| 19 | 140 |
| 20 | -6 |
| 21 | 4096 |
| 22 | -12288 |
| 23 | 14080 |
| 24 | -7680 |
| 25 | 2016 |
| 26 | -224 |
| 27 | 7 |
| 28 | 16384 |
| 29 | -57344 |
| 30 | 79872 |
| 31 | -56320 |
| 32 | 21120 |
| 33 | -4032 |
| 34 | 336 |
| 35 | -8 |
| 36 | 65536 |
| 37 | -262144 |
| 38 | 430080 |
| 39 | -372736 |
| 40 | 183040 |
| 41 | -50688 |
| 42 | 7392 |
| 43 | -480 |
| 44 | 9 |
| 45 | 262144 |
| 46 | -1179648 |
| 47 | 2228224 |
| 48 | -2293760 |
| 49 | 1397760 |