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 | 6 |
| 2 | 18 |
| 3 | 90 |
| 4 | 479 |
| 5 | 2718 |
| 6 | 16126 |
| 7 | 97885 |
| 8 | 603741 |
| 9 | 3771287 |
| 10 | 23792622 |
| 11 | 151342506 |
| 12 | 969465873 |
| 13 | 6248109573 |