2391484

Appears in sequences

• a(n) = (3^n - 1)/2.at n=14A003462
• Erroneous version of A003462.at n=12A045886
• Numbers that are repdigits in base 3.at n=27A048328
• a(n) = a(n-1) + 3*a(n-2) - 3*a(n-3), with a(0)=a(1)=1, a(2)=4.at n=26A052993
• a(n) = a(n-1) + 3*a(n-2) - 3*a(n-3), with a(0)=a(1)=1, a(2)=4.at n=27A052993
• Number of primitive (aperiodic) palindromic structures using a maximum of three different symbols.at n=29A056477
• Number of primitive (period n) periodic palindromic structures using a maximum of three different symbols.at n=29A056514
• a(n) = (-1)^n * (3^n - 1)/2.at n=14A076040
• Numbers of the form (3^{mr}-1)/(3^r-1) for positive integers m, r.at n=37A076270
• Maximal cycle lengths in a certain class of one-dimensional cellular automata.at n=26A085591
• Expansion of (1+3x)/((1-x^2)(1-3x^2)).at n=26A094025
• a(n) = Sum_{j=0..13} n^j.at n=3A104376
• Expansion of x*(1+x+2*x^3) / ((x-1)*(1+x)*(3*x^2-1)).at n=27A120463
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,4,14,41.at n=13A132357
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=13A133453
• a(n) = 4*a(n-1) - 7*a(n-2) + 6*a(n-3) - 3*a(n-4), starting with 0, 1, 2, 3.at n=28A134581
• a(n) = 4*a(n-1) - 7*a(n-2) + 6*a(n-3) - 3*a(n-4), starting with 0, 1, 2, 3.at n=29A134581
• 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=39A140298
• First differences of A140298.at n=43A140313
• First differences of A140298.at n=44A140313