4185098

Appears in sequences

• Main diagonal of number array A083064.at n=7A083069
• a(2*n) = 3*a(2*n-1), a(2*n+1) = 3*a(2*n) - 1, with a(1) = 1.at n=14A153774
• a(n) = (7*9^n + 1)/8.at n=7A187709