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 | 4 |
| 2 | 9 |
| 3 | 125 |
| 4 | 49 |
| 5 | 161051 |
| 6 | 2197 |
| 7 | 410338673 |
| 8 | 130321 |
| 9 | 12167 |
| 10 | 12200509765705829 |
| 11 | 923521 |
| 12 | 94931877133 |
| 13 | 1555098314991537910888601 |
| 14 | 11688200277601 |
| 15 | 10779215329 |
| 16 | 1174711139837 |
| 17 | 15413179794770734626518662321719325259 |
| 18 | 191707312997281 |
| 19 | 8182718904632857144561 |
| 20 | 19118715823042429491729074582041753821507871751 |
| 21 | 58871586708267913 |