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 | 54 |
| 3 | 1838 |
| 4 | 77793 |
| 5 | 3607078 |
| 6 | 174854516 |
| 7 | 8684742989 |
| 8 | 437757725110 |
| 9 | 22283207886650 |
| 10 | 1142441203546438 |
| 11 | 58904154561219603 |
| 12 | 3051594326913582293 |
| 13 | 158760240705250821719 |
| 14 | 8291742411017787312243 |
| 15 | 434658935860309950718887 |