A092176 A067076 + A000079/2.
0, 1, 3, 6, 12, 21, 39, 72, 138, 269, 526, 1041, 2067, 4116, 8214, 16409, 32796, 65565, 131104, 262178, 524323, 1048614, 2097192, 4194347, 8388655, 16777265, 33554482, 67108916, 134217781
Offset: 0
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.