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 | 4 |
| 2 | 10 |
| 3 | 57 |
| 4 | 1054 |
| 5 | 2626 |
| 6 | 68727 |
| 7 | 12371554 |
| 8 | 1673018314 |
| 9 | 10475647197 |
| 10 | 11154517557 |
| 11 | 27594844918 |
| 12 | 630178495917 |
| 13 | 7239182861878 |