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 | 3 |
| 2 | 13 |
| 3 | 781 |
| 4 | 137257 |
| 5 | 28531167061 |
| 6 | 25239592216021 |
| 7 | 51702516367896047761 |
| 8 | 109912203092239643840221 |
| 9 | 949112181811268728834319677753 |
| 10 | 91703076898614683377208150526107718802981 |