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 | 5 |
| 2 | 65 |
| 3 | 979 |
| 4 | 15345 |
| 5 | 247535 |
| 6 | 4069155 |
| 7 | 67773805 |
| 8 | 1139789185 |
| 9 | 19311870095 |
| 10 | 329149434263 |
| 11 | 5637030686105 |
| 12 | 96925730626035 |
| 13 | 1672193347218577 |
| 14 | 28932082285914005 |
| 15 | 501821453320612915 |
| 16 | 8722842168045249345 |
| 17 | 151912536408383664095 |
| 18 | 2650102280875677625415 |