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 | 5 |
| 2 | 65 |
| 3 | 1951 |
| 4 | 127813 |
| 5 | 17790765 |
| 6 | 5193620491 |
| 7 | 3160001994563 |
| 8 | 3995872591050989 |
| 9 | 10489950826300197841 |
| 10 | 57160724000127089232531 |