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 | 495 |
| 3 | 5950 |
| 4 | 58065 |
| 5 | 486606 |
| 6 | 3622850 |
| 7 | 24508320 |
| 8 | 153065370 |
| 9 | 893004950 |
| 10 | 4910926857 |
| 11 | 25638586740 |
| 12 | 127801113520 |
| 13 | 611122860870 |
| 14 | 2814360594975 |
| 15 | 12523572401730 |
| 16 | 54001382371560 |
| 17 | 226189483208580 |