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) |
|---|---|
| 2 | 3 |
| 3 | 7 |
| 4 | 73 |
| 5 | 141 |
| 6 | 1417 |
| 7 | 17130 |
| 8 | 11677 |
| 9 | 187955 |
| 10 | 10252371 |
| 11 | 20440221 |
| 12 | 1550384575 |
| 13 | 10645648530 |
| 14 | 80224807014 |
| 15 | 829050923579 |
| 16 | 17071371319785 |
| 17 | 599574561430568 |