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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | -1 |
| 5 | -1 |
| 6 | 0 |
| 7 | 1 |
| 8 | 1 |
| 9 | -2 |
| 10 | 10 |
| 11 | 2 |
| 12 | -1609 |
| 13 | 2 |
| 14 | -2 |
| 15 | -2 |
| 16 | -2 |
| 17 | -14 |
| 18 | -15550555555 |
| 19 | -1 |
| 20 | -1 |
| 21 | 0 |
| 22 | 1 |
| 23 | 1 |
| 24 | -2218888517 |
| 25 | -8778405442862239 |
| 26 | 2 |
| 27 | 2 |
| 28 | 2 |
| 29 | -3 |
| 30 | -3 |
| 31 | 134476 |
| 32 | 80435758145817515 |
| 33 | 2 |
| 34 | -7 |
| 35 | -3 |
| 36 | 3 |
| 37 | 7 |
| 38 | -26 |
| 39 | 659 |
| 40 | 60702901317 |
| 41 | 3 |
| 42 | -11 |
| 43 | 3 |
| 44 | -21 |
| 45 | -2 |
| 46 | -4 |
| 47 | -4 |
| 48 | 3 |
| 49 | -1 |
| 50 | 0 |
| 51 | 1 |
| 52 | 1 |
| 53 | -4 |
| 54 | 20 |
| 55 | 2 |
| 56 | 9 |
| 57 | 2 |