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 | 9 |
| 3 | 129 |
| 4 | 5617 |
| 5 | 964755 |
| 6 | 617429805 |
| 7 | 1436456861467 |
| 8 | 12128014243816259 |
| 9 | 370157141019558632729 |
| 10 | 40729998558184127557326187 |
| 11 | 16129157077874837008807129310501 |
| 12 | 22956060013827748812137293758719842059 |
| 13 | 117308080543566432787532732819884994609487361 |