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 | 6 |
| 2 | 48 |
| 3 | 438 |
| 4 | 4356 |
| 5 | 46056 |
| 6 | 509106 |
| 7 | 5814738 |
| 8 | 68050116 |
| 9 | 811240872 |
| 10 | 9810384048 |
| 11 | 119990105208 |
| 12 | 1481115683754 |
| 13 | 18421300391760 |
| 14 | 230574816629310 |
| 15 | 2901721280735838 |
| 16 | 36688485233689668 |
| 17 | 465774244616805624 |
| 18 | 5934465567864915024 |