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 | 16 |
| 3 | 227 |
| 4 | 3182 |
| 5 | 44553 |
| 6 | 623748 |
| 7 | 8732479 |
| 8 | 122254714 |
| 9 | 1711566005 |
| 10 | 23961924080 |
| 11 | 335466937131 |
| 12 | 4696537119846 |
| 13 | 65751519677857 |
| 14 | 920521275490012 |
| 15 | 12887297856860183 |
| 16 | 180422169996042578 |
| 17 | 2525910379944596109 |
| 18 | 35362745319224345544 |
| 19 | 495078434469140837635 |
| 20 | 6931098082567971726910 |