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 | -2 |
| 4 | -5 |
| 5 | -10 |
| 6 | -18 |
| 7 | -30 |
| 8 | -48 |
| 9 | -77 |
| 10 | -127 |
| 11 | -213 |
| 12 | -351 |
| 13 | -551 |
| 14 | -817 |
| 15 | -1181 |
| 16 | -1819 |
| 17 | -3304 |
| 18 | -7003 |
| 19 | -15454 |
| 20 | -32185 |
| 21 | -59830 |
| 22 | -94733 |
| 23 | -116204 |
| 24 | -70931 |
| 25 | 138782 |
| 26 | 634477 |
| 27 | 1440741 |
| 28 | 2129014 |
| 29 | 995270 |
| 30 | -6559829 |
| 31 | -30802323 |
| 32 | -91672920 |
| 33 | -223074852 |
| 34 | -473661244 |
| 35 | -893720326 |
| 36 | -1483495634 |
| 37 | -2049478628 |