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 | 13 |
| 2 | 661 |
| 3 | 46705 |
| 4 | 3833941 |
| 5 | 342981013 |
| 6 | 32443313449 |
| 7 | 3191377294153 |
| 8 | 323158664855125 |
| 9 | 33461619685494025 |
| 10 | 3526747995762849661 |
| 11 | 377103695616260979313 |
| 12 | 40807220545026078297961 |
| 13 | 4460530114068960956304865 |
| 14 | 491780450707942086338993761 |
| 15 | 54624008737670717933342875705 |