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 | 5 |
| 3 | 18 |
| 4 | 74 |
| 5 | 2098 |
| 6 | 54286 |
| 7 | 1810441 |
| 8 | 227074899 |
| 9 | 41069612676 |
| 10 | 11999602459480 |
| 11 | 8460640112181759 |
| 12 | 10489963059013433653 |