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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 21 |
| 4 | 239 |
| 5 | 9847 |
| 6 | 1550791 |
| 7 | 883584231 |
| 8 | 1794242777079 |
| 9 | 13029751067176631 |
| 10 | 341273461704039756983 |
| 11 | 32523250658517590150954423 |
| 12 | 11366777954076059092024044958647 |
| 13 | 14669097059490883945096188099361179575 |
| 14 | 70315671284332059012269451652168003452397495 |