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 | 42 |
| 2 | 63504 |
| 3 | 3456649728 |
| 4 | 6773484887801856 |
| 5 | 477827850919028491026432 |
| 6 | 1213481763117613016471583634489344 |
| 7 | 110942398014527364799038852663129544775958528 |