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 | 0 |
| 3 | 3 |
| 4 | 1 |
| 5 | 0 |
| 6 | 2 |
| 7 | 45 |
| 8 | 22 |
| 9 | 3 |
| 10 | 0 |
| 11 | 0 |
| 12 | 10 |
| 13 | 107 |
| 14 | 61 |
| 15 | 13 |
| 16 | 1 |
| 17 | 0 |
| 18 | -48 |
| 19 | 20 |
| 20 | 2100 |
| 21 | 14855 |
| 22 | 9168 |
| 23 | 2390 |
| 24 | 300 |
| 25 | 15 |
| 26 | 0 |
| 27 | 0 |
| 28 | -336 |
| 29 | 92 |
| 30 | 6320 |
| 31 | 33765 |
| 32 | 21803 |
| 33 | 6378 |
| 34 | 1010 |
| 35 | 85 |
| 36 | 3 |
| 37 | 0 |
| 38 | 11520 |
| 39 | -2016 |
| 40 | -198296 |
| 41 | 33012 |
| 42 | 2199246 |
| 43 | 9547461 |
| 44 | 6331782 |
| 45 | 1994265 |
| 46 | 362474 |
| 47 | 39375 |
| 48 | 2394 |
| 49 | 63 |