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 | 1 |
| 4 | 0 |
| 5 | -1 |
| 6 | -2 |
| 7 | -3 |
| 8 | -2 |
| 9 | 1 |
| 10 | 6 |
| 11 | 13 |
| 12 | 16 |
| 13 | 9 |
| 14 | -14 |
| 15 | -59 |
| 16 | -108 |
| 17 | -119 |
| 18 | -26 |
| 19 | 261 |
| 20 | 736 |
| 21 | 1177 |
| 22 | 1026 |
| 23 | -731 |
| 24 | -4964 |
| 25 | -11079 |
| 26 | -14978 |
| 27 | -6299 |
| 28 | 30024 |
| 29 | 102841 |
| 30 | 189466 |
| 31 | 190917 |
| 32 | -97004 |
| 33 | -921191 |
| 34 | -2301354 |
| 35 | -3396539 |
| 36 | -1674368 |
| 37 | 7265241 |
| 38 | 27311794 |
| 39 | 53600101 |
| 40 | 56943756 |
| 41 | -31760903 |
| 42 | -310594514 |
| 43 | -809146971 |