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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -2 |
| 4 | -1 |
| 5 | -4 |
| 6 | 2 |
| 7 | -8 |
| 8 | -1 |
| 9 | 0 |
| 10 | 4 |
| 11 | -16 |
| 12 | 2 |
| 13 | -32 |
| 14 | 8 |
| 15 | 12 |
| 16 | -1 |
| 17 | -64 |
| 18 | 0 |
| 19 | -128 |
| 20 | 4 |
| 21 | 24 |
| 22 | 16 |
| 23 | -256 |
| 24 | 2 |
| 25 | 8 |
| 26 | 32 |
| 27 | 0 |
| 28 | 8 |
| 29 | -512 |
| 30 | -12 |
| 31 | -1024 |
| 32 | -1 |
| 33 | 48 |
| 34 | 64 |
| 35 | 56 |
| 36 | 0 |
| 37 | -2048 |
| 38 | 128 |
| 39 | 96 |
| 40 | 4 |
| 41 | -4096 |
| 42 | -24 |
| 43 | -8192 |
| 44 | 16 |
| 45 | -8 |
| 46 | 256 |
| 47 | -16384 |
| 48 | 2 |
| 49 | 48 |
| 50 | -8 |
| 51 | 192 |
| 52 | 32 |
| 53 | -32768 |
| 54 | 0 |
| 55 | 112 |
| 56 | 8 |
| 57 | 384 |
| 58 | 512 |
| 59 | -65536 |
| 60 | -12 |
| 61 | -131072 |
| 62 | 1024 |
| 63 | -16 |
| 64 | -1 |
| 65 | 224 |
| 66 | -48 |
| 67 | -262144 |
| 68 | 64 |
| 69 | 768 |