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 | 21 |
| 3 | 61 |
| 4 | 1891 |
| 5 | 9633 |
| 6 | 404713 |
| 7 | 2997541 |
| 8 | 159902271 |
| 9 | 1564345201 |
| 10 | 101406750589 |
| 11 | 1236882490845 |
| 12 | 94479649710811 |
| 13 | 1382731226210881 |
| 14 | 121677107761110993 |
| 15 | 2079381120597925237 |
| 16 | 207197254527662127511 |
| 17 | 4051708966720224576081 |