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 | 7 |
| 3 | 49 |
| 4 | 337 |
| 5 | 2323 |
| 6 | 15805 |
| 7 | 107737 |
| 8 | 727619 |
| 9 | 4921655 |
| 10 | 33056939 |
| 11 | 222323989 |
| 12 | 1487064391 |
| 13 | 9957971965 |
| 14 | 66391431607 |
| 15 | 443085643919 |
| 16 | 2946553003837 |
| 17 | 19611967535129 |
| 18 | 130149475953673 |