A128933 A103828(n) + 1.
2, 4, 10, 28, 70, 430, 1060, 56500, 166840, 5020060, 7681810, 274343590, 8316187180
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.