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 | 21 |
| 2 | 781 |
| 3 | 31529 |
| 4 | 1292697 |
| 5 | 53175517 |
| 6 | 2188978117 |
| 7 | 90124167441 |
| 8 | 3710708201969 |
| 9 | 152783289861989 |
| 10 | 6290652543875133 |
| 11 | 259009513044645817 |
| 12 | 10664383939345916681 |
| 13 | 439092316687230373293 |
| 14 | 18079062471131097321077 |