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 | 144 |
| 2 | 51205 |
| 3 | 21001799 |
| 4 | 8940739824 |
| 5 | 3852472573499 |
| 6 | 1666961188795475 |
| 7 | 722364079570222320 |
| 8 | 313196612952258199679 |
| 9 | 135818983640055277506397 |
| 10 | 58902468764522025160456848 |
| 11 | 25545661075321867247577262777 |
| 12 | 11079103257893769392837296086025 |