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 | 2 |
| 2 | 15 |
| 3 | 130 |
| 4 | 4852 |
| 5 | 456904 |
| 6 | 73948482 |
| 7 | 35616138799 |
| 8 | 43142990277818 |
| 9 | 115017363443317954 |
| 10 | 771239506285440035857 |