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 | 9 |
| 2 | 272 |
| 3 | 14408 |
| 4 | 1081730 |
| 5 | 104985728 |
| 6 | 12487616539 |
| 7 | 1758172862980 |
| 8 | 285903205720512 |
| 9 | 52725376090628155 |
| 10 | 10872393464815690144 |
| 11 | 2478802987043990078456 |
| 12 | 619122710473385614426210 |
| 13 | 168115507427305189329095427 |