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 | 3 |
| 2 | 33 |
| 3 | 3927 |
| 4 | 55602393 |
| 5 | 11147016454528647 |
| 6 | 448011292165037607943004375755833 |
| 7 | 723685043824607606355691108666081531638582859833105061571146291527 |