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) |
|---|---|
| 40 | 1 |
| 41 | 41 |
| 42 | 861 |
| 43 | 12341 |
| 44 | 135751 |
| 45 | 1221759 |
| 46 | 9366819 |
| 47 | 62891499 |
| 48 | 377348994 |
| 49 | 2054455634 |
| 50 | 10272278170 |
| 51 | 47626016970 |
| 52 | 206379406870 |
| 53 | 841392966470 |
| 54 | 3245372870670 |
| 55 | 11899700525790 |
| 56 | 41648951840265 |
| 57 | 139646485582065 |
| 58 | 449972009097765 |
| 59 | 1397281501935165 |
| 60 | 4191844505805495 |