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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 32 |
| 5 | 600 |
| 6 | 20544 |
| 7 | 1218224 |
| 8 | 160241152 |
| 9 | 42129744768 |
| 10 | 21293228876800 |
| 11 | 22220602090444032 |
| 12 | 45959959305969143808 |
| 13 | 188702851949391611599872 |
| 14 | 1566370829898884830446395392 |
| 15 | 25801614282517307546368494213120 |
| 16 | 851300764257208779000509484701188096 |