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 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 2 |
| 8 | -1 |
| 9 | 0 |
| 10 | 4 |
| 11 | -6 |
| 12 | 6 |
| 13 | 6 |
| 14 | -24 |
| 15 | 38 |
| 16 | -17 |
| 17 | -64 |
| 18 | 188 |
| 19 | -230 |
| 20 | -6 |
| 21 | 662 |
| 22 | -1432 |
| 23 | 1286 |
| 24 | 1210 |
| 25 | -6362 |
| 26 | 10692 |
| 27 | -5530 |
| 28 | -18274 |
| 29 | 57022 |
| 30 | -74364 |
| 31 | 174 |
| 32 | 216703 |
| 33 | -489544 |
| 34 | 467860 |
| 35 | 391258 |
| 36 | -2256430 |
| 37 | 3948206 |
| 38 | -2234064 |
| 39 | -6725362 |
| 40 | 21920402 |
| 41 | -29716570 |
| 42 | 2095564 |
| 43 | 84595798 |
| 44 | -198418242 |
| 45 | 197499846 |