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 | 150 |
| 2 | 67330 |
| 3 | 266060160 |
| 4 | 11348244616180 |
| 5 | 4705518067315949795 |
| 6 | 19869188673828370548366580 |
| 7 | 837185450907978354702239657652981 |