338992928

Appears in sequences

• a(2*n) = 3*a(2*n-1), a(2*n+1) = 3*a(2*n) - 1, with a(1) = 1.at n=18A153774
• a(n) = (7*9^n + 1)/8.at n=9A187709
• a(n) = n^n-n^(n-1)-n^(n-2)-...-n^2-n-1.at n=8A191690