598852domain: NAppears in sequences1 - (5/6)*n + (5/2)*n^2 + (10/3)*n^3 + n^4.at n=27A057675Transform of 1 by the T_{1,1} transformation (see link).at n=15A159328Number of binary strings of length n with no substrings equal to 0001 or 0100.at n=23A164394