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 | 2 |
| 1 | 6 |
| 2 | 30 |
| 3 | 222 |
| 4 | 2190 |
| 5 | 27006 |
| 6 | 399630 |
| 7 | 6899262 |
| 8 | 136125390 |
| 9 | 3021538686 |
| 10 | 74520313230 |
| 11 | 2021686771902 |
| 12 | 59833117024590 |
| 13 | 1918366107872766 |
| 14 | 66237821635330830 |
| 15 | 2450438532592334142 |
| 16 | 96696400596369539790 |