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 | 3 |
| 2 | 27 |
| 3 | 513 |
| 4 | 16929 |
| 5 | 863379 |
| 6 | 63026667 |
| 7 | 6239640033 |
| 8 | 804913564257 |
| 9 | 131200910973891 |
| 10 | 26371383105752091 |
| 11 | 6408246094697758113 |
| 12 | 1851983121367652094657 |
| 13 | 627822278143634060088723 |
| 14 | 246734155310448185614868139 |
| 15 | 111277104045012131712305530689 |