7174453

Appears in sequences

• a(n) = (3^n - 1)/2.at n=15A003462
• Number of free subsets of multiplicative group of GF(3^n).at n=14A007231
• Erroneous version of A003462.at n=13A045886
• a(n) = 2*a(n-1) + 3*a(n-2), a(0) = a(1) = 1.at n=15A046717
• Numbers that are repdigits in base 3.at n=29A048328
• a(n) = a(n-1) + 3*a(n-2) - 3*a(n-3), with a(0)=a(1)=1, a(2)=4.at n=28A052993
• a(n) = a(n-1) + 3*a(n-2) - 3*a(n-3), with a(0)=a(1)=1, a(2)=4.at n=29A052993
• Number of primitive (aperiodic) palindromic structures using a maximum of three different symbols.at n=31A056477
• Number of primitive (period n) periodic palindromic structures using a maximum of three different symbols.at n=31A056514
• Binomial transform of Jacobsthal gap sequence (A080924).at n=15A080925
• Expansion of (1+3x)/((1-x^2)(1-3x^2)).at n=28A094025
• a(n) = (3*9^n - 1)/2.at n=7A096053
• a(n) = Sum_{j=0..14} n^j.at n=3A104682
• Expansion of x*(1+x+2*x^3) / ((x-1)*(1+x)*(3*x^2-1)).at n=29A120463
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,5,13,40.at n=14A133448
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=14A133453
• a(0)=1; a(3n+1) = a(3n)+1, a(3n+2) = a(3n+1) + a(3n) (=3*A000244), a(3n+3) = a(3n+2) + a(3n) (=A003462(n+2)).at n=42A140298
• First differences of A140298.at n=46A140313
• First differences of A140298.at n=47A140313
• a(n) = (3^n-1)/2 if n odd, (3^n-1)/8 if n even.at n=15A152298