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 | 1 |
| 2 | 17 |
| 3 | 190 |
| 4 | 1672 |
| 5 | 12671 |
| 6 | 86275 |
| 7 | 542235 |
| 8 | 3200979 |
| 9 | 17970009 |
| 10 | 96806505 |
| 11 | 503889439 |
| 12 | 2547775803 |
| 13 | 12567000344 |
| 14 | 60679921204 |
| 15 | 287630757639 |
| 16 | 1341627687593 |
| 17 | 6170270168142 |
| 18 | 28028072584878 |
| 19 | 125932459466866 |
| 20 | 560392344329658 |