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 | 0 |
| 3 | -2 |
| 4 | -1 |
| 5 | 3 |
| 6 | 6 |
| 7 | 0 |
| 8 | -11 |
| 9 | -11 |
| 10 | 12 |
| 11 | 34 |
| 12 | 11 |
| 13 | -57 |
| 14 | -78 |
| 15 | 36 |
| 16 | 193 |
| 17 | 121 |
| 18 | -264 |
| 19 | -506 |
| 20 | 23 |
| 21 | 1035 |
| 22 | 990 |
| 23 | -1080 |
| 24 | -3059 |
| 25 | -899 |
| 26 | 5220 |
| 27 | 7018 |
| 28 | -3421 |
| 29 | -17457 |
| 30 | -10614 |
| 31 | 24300 |
| 32 | 45529 |
| 33 | -3071 |
| 34 | -94128 |
| 35 | -87986 |
| 36 | 100271 |
| 37 | 276243 |
| 38 | 75702 |
| 39 | -476784 |
| 40 | -628187 |
| 41 | 325381 |
| 42 | 1581756 |
| 43 | 930994 |
| 44 | -2232517 |
| 45 | -4094505 |
| 46 | 370530 |