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 | 9 |
| 2 | 81 |
| 3 | 879 |
| 4 | 11739 |
| 5 | 190044 |
| 6 | 3654814 |
| 7 | 81947221 |
| 8 | 2107962168 |
| 9 | 61366149296 |
| 10 | 1998607800064 |
| 11 | 72112467306074 |
| 12 | 2858551691428042 |
| 13 | 123596917897265255 |
| 14 | 5792708223233376744 |
| 15 | 292682081981049699408 |
| 16 | 15865848522184194142469 |