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 | 0 |
| 1 | 1 |
| 2 | 48 |
| 3 | 2257 |
| 4 | 106080 |
| 5 | 4985761 |
| 6 | 234330768 |
| 7 | 11013546097 |
| 8 | 517636666560 |
| 9 | 24328923328321 |
| 10 | 1143459396431088 |
| 11 | 53742591632261137 |
| 12 | 2525901806716273440 |
| 13 | 118717384915664851681 |
| 14 | 5579717091036248029008 |
| 15 | 262246703278703657363377 |
| 16 | 12325595054099071896078720 |