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 | 18 |
| 2 | 152 |
| 3 | 3031 |
| 4 | 21481224 |
| 5 | 25502420 |
| 6 | 4007565001480 |
| 7 | 2196125475223740 |
| 8 | 905295493763807066010 |