700074

Appears in sequences

• Number of primitive (aperiodic) palindromic structures using a maximum of four different symbols.at n=23A056478
• Number of primitive (period n) periodic palindromic structures using a maximum of four different symbols.at n=23A056515
• a(n) = (2^n + 4)*(2^n - 1)/6.at n=11A076024
• Smallest m > 0 such that the triangular number m*(m+1)/2 is divisible by 2^n-1.at n=21A343995