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 | 65 |
| 3 | 475 |
| 4 | 3465 |
| 5 | 25282 |
| 6 | 184463 |
| 7 | 1345887 |
| 8 | 9819916 |
| 9 | 71648478 |
| 10 | 522764591 |
| 11 | 3814216651 |
| 12 | 27829445433 |
| 13 | 203050351876 |
| 14 | 1481504383412 |
| 15 | 10809413614854 |
| 16 | 78868091114176 |
| 17 | 575440631436879 |
| 18 | 4198553757680021 |
| 19 | 30633661742154286 |
| 20 | 223510591001999469 |
| 21 | 1630787227154056312 |