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 | 0 |
| 3 | -1 |
| 4 | -2 |
| 5 | -4 |
| 6 | -5 |
| 7 | -9 |
| 8 | -11 |
| 9 | -17 |
| 10 | -21 |
| 11 | -32 |
| 12 | -38 |
| 13 | -58 |
| 14 | -70 |
| 15 | -97 |
| 16 | -122 |
| 17 | -170 |
| 18 | -206 |
| 19 | -284 |
| 20 | -349 |
| 21 | -463 |
| 22 | -573 |
| 23 | -752 |
| 24 | -919 |
| 25 | -1199 |
| 26 | -1466 |
| 27 | -1869 |
| 28 | -2289 |
| 29 | -2904 |
| 30 | -3518 |
| 31 | -4432 |
| 32 | -5371 |
| 33 | -6676 |
| 34 | -8072 |
| 35 | -9970 |
| 36 | -11985 |
| 37 | -14739 |
| 38 | -17667 |
| 39 | -21522 |
| 40 | -25747 |
| 41 | -31242 |
| 42 | -37176 |
| 43 | -44905 |