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 | 15 |
| 3 | 171 |
| 4 | 2799 |
| 5 | 46933 |
| 6 | 831358 |
| 7 | 15085844 |
| 8 | 279317154 |
| 9 | 5247744254 |