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 | 7 |
| 3 | 60 |
| 4 | 704 |
| 5 | 9189 |
| 6 | 126759 |
| 7 | 1802312 |
| 8 | 26152418 |
| 9 | 385221143 |
| 10 | 5741256764 |
| 11 | 86383382827 |
| 12 | 1309998125640 |
| 13 | 19998172734786 |
| 14 | 307022182222506 |
| 15 | 4736694001644862 |
| 16 | 73390033697855860 |
| 17 | 1141388483146794007 |
| 18 | 17810678207278478530 |