A122231 Iterates of A122227, starting from A122227(4)=17.
4, 17, 64, 183, 560, 2036, 6397, 20414, 79204, 262714, 870210, 3640880
Offset: 1
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.