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 | 39 |
| 3 | 543 |
| 4 | 7563 |
| 5 | 105339 |
| 6 | 1467183 |
| 7 | 20435223 |
| 8 | 284625939 |
| 9 | 3964327923 |
| 10 | 55215964983 |
| 11 | 769059181839 |
| 12 | 10711612580763 |
| 13 | 149193516948843 |
| 14 | 2077997624703039 |
| 15 | 28942773228893703 |
| 16 | 403120827579808803 |
| 17 | 5614748812888429539 |
| 18 | 78203362552858204743 |
| 19 | 1089232326927126436863 |
| 20 | 15171049214426911911339 |