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 | 63 |
| 2 | 2205 |
| 3 | 56595 |
| 4 | 1188495 |
| 5 | 21630609 |
| 6 | 353299947 |
| 7 | 5299499205 |
| 8 | 74192988870 |
| 9 | 980996186170 |
| 10 | 12360551945742 |
| 11 | 149450309889426 |
| 12 | 1743586948709970 |
| 13 | 19715944727720430 |
| 14 | 216875392004924730 |
| 15 | 2327795874186192102 |
| 16 | 24441856678955017071 |
| 17 | 251607348165713411025 |