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 | 1 |
| 2 | 9 |
| 3 | 100 |
| 4 | 1323 |
| 5 | 20088 |
| 6 | 342430 |
| 7 | 6461208 |
| 8 | 133618275 |
| 9 | 3006094768 |
| 10 | 73139285178 |
| 11 | 1914937983000 |
| 12 | 53720914023150 |
| 13 | 1608612191370000 |
| 14 | 51235727245542684 |
| 15 | 1730349877484075120 |
| 16 | 61783682196714238755 |
| 17 | 2326122843950925857376 |
| 18 | 92117389831885545623650 |
| 19 | 3828375469597215729851928 |