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 | 2 |
| 2 | 12 |
| 3 | 178 |
| 4 | 5990 |
| 5 | 435801 |
| 6 | 66593821 |
| 7 | 20997402098 |
| 8 | 13512727916532 |
| 9 | 17629371074833300 |
| 10 | 46432767742317108086 |
| 11 | 246240366959004185679198 |
| 12 | 2624854986865673643625591411 |
| 13 | 56179604057909797695704800461149 |