265716

Appears in sequences

• Number of primitive (aperiodic) palindromic structures using a maximum of three different symbols.at n=25A056477
• Number of primitive (period n) periodic palindromic structures using a maximum of three different symbols.at n=25A056514
• Expansion of 3*x*(3*x+1)*(2*x-1) / ( (1+x)*(3*x^2+1) ).at n=21A143769
• a(n) = 9*(3^n - 1)/2.at n=10A168569
• Numbers of the form k*(k^5 +- 1)/2.at n=16A361263