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 | 1 |
| 3 | 4 |
| 4 | 19 |
| 5 | 136 |
| 6 | 1226 |
| 7 | 12259 |
| 8 | 130435 |
| 9 | 1441755 |
| 10 | 16390266 |
| 11 | 190484723 |
| 12 | 2254489731 |
| 13 | 27096464528 |
| 14 | 329995577356 |
| 15 | 4065180800962 |
| 16 | 50584233942184 |