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 | 0 |
| 1 | -1 |
| 2 | 9 |
| 3 | 131 |
| 4 | 1396 |
| 5 | 13786 |
| 6 | 131537 |
| 7 | 1239745 |
| 8 | 11665803 |
| 9 | 109941002 |
| 10 | 1038723932 |
| 11 | 9841935529 |
| 12 | 93518105160 |
| 13 | 891022511814 |
| 14 | 8510960557278 |
| 15 | 81485246876212 |
| 16 | 781818951793344 |