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 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 217 |
| 5 | 2185 |
| 6 | 27965 |
| 7 | 424325 |
| 8 | 7379185 |
| 9 | 145153105 |
| 10 | 3196294325 |
| 11 | 77897895725 |
| 12 | 2079802839625 |
| 13 | 60350978376025 |
| 14 | 1891418286217325 |
| 15 | 63678498456207125 |
| 16 | 2292013408161318625 |
| 17 | 87825945807276510625 |
| 18 | 3569447845239610305125 |
| 19 | 153366779265711453624125 |