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 | 2 |
| 3 | 1 |
| 4 | -4 |
| 5 | -13 |
| 6 | -22 |
| 7 | -23 |
| 8 | -8 |
| 9 | 23 |
| 10 | 54 |
| 11 | 53 |
| 12 | -12 |
| 13 | -141 |
| 14 | -270 |
| 15 | -271 |
| 16 | -16 |
| 17 | 495 |
| 18 | 1006 |
| 19 | 1005 |
| 20 | -20 |
| 21 | -2069 |
| 22 | -4118 |
| 23 | -4119 |
| 24 | -24 |
| 25 | 8167 |
| 26 | 16358 |
| 27 | 16357 |
| 28 | -28 |
| 29 | -32797 |
| 30 | -65566 |
| 31 | -65567 |
| 32 | -32 |
| 33 | 131039 |
| 34 | 262110 |
| 35 | 262109 |
| 36 | -36 |
| 37 | -524325 |
| 38 | -1048614 |
| 39 | -1048615 |
| 40 | -40 |
| 41 | 2097111 |
| 42 | 4194262 |
| 43 | 4194261 |
| 44 | -44 |