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 | 1 |
| 1 | -1 |
| 2 | 1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 3 |
| 6 | -2 |
| 7 | -1 |
| 8 | 6 |
| 9 | -10 |
| 10 | 8 |
| 11 | 2 |
| 12 | -19 |
| 13 | 34 |
| 14 | -30 |
| 15 | -3 |
| 16 | 60 |
| 17 | -112 |
| 18 | 106 |
| 19 | -2 |
| 20 | -188 |
| 21 | 370 |
| 22 | -373 |
| 23 | 48 |
| 24 | 586 |
| 25 | -1226 |
| 26 | 1307 |
| 27 | -296 |
| 28 | -1808 |
| 29 | 4046 |
| 30 | -4546 |
| 31 | 1430 |
| 32 | 5516 |
| 33 | -13300 |
| 34 | 15724 |
| 35 | -6217 |
| 36 | -16626 |
| 37 | 43566 |
| 38 | -54132 |
| 39 | 25464 |
| 40 | 49373 |
| 41 | -142146 |
| 42 | 185496 |
| 43 | -100306 |
| 44 | -143896 |
| 45 | 461874 |
| 46 | -632864 |
| 47 | 384348 |
| 48 | 409270 |
| 49 | -1494356 |
| 50 | 2150240 |