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 | 30 |
| 2 | 1200 |
| 3 | 70000 |
| 4 | 5880000 |
| 5 | 691488000 |
| 6 | 110638080000 |
| 7 | 23471078400000 |
| 8 | 6454546560000000 |
| 9 | 2256222608640000000 |
| 10 | 985518035453952000000 |
| 11 | 529939925428193280000000 |
| 12 | 346227417946419609600000000 |
| 13 | 271655358696421539840000000000 |
| 14 | 253338025938605687439360000000000 |
| 15 | 278215820085776765945905152000000000 |
| 16 | 356811789260008702325623357440000000000 |