258280326

Appears in sequences

• Pisot sequences E(2,6), L(2,6), P(2,6), T(2,6).at n=17A008776
• a(0)=1; a(n) = 2*3^(n-1) for n >= 1.at n=18A025192
• a(n) = Sum_{k=0..m} (k+1) * A026148(n, m-k), where m=0 for n=1; m=n+1 for n >= 2.at n=17A027334
• a(2n) = 3^n, a(2n+1) = 2*3^n.at n=35A038754
• a(n) = Sum_{j=0..floor(n/3)} (-1)^j*binomial(n,3*j).at n=36A057681
• Number of ternary trees (A001764) with n nodes and maximal diameter.at n=16A064017
• a(n) = phi(n^n).at n=8A064447
• Number of n-step walks (each step +-1 starting from 0) which are never more than 2 or less than -2.at n=35A068911
• Expansion of (1+2*x+6*x^2)/(1-9*x^3).at n=26A076738
• a(n) = 2^A066657(n) * 3^A066658(n).at n=29A076941
• Largest term in periodic part of continued fraction expansion of square root of 1+3^n or 0 if 1+3^n is square.at n=33A077626
• Sum of terms in periodic part of continued fraction expansion of square root of 1+3^n.at n=33A077630
• Binomial transform of a Jacobsthal trisection.at n=9A092810
• Expansion of (1+3*x)/(1-3*x).at n=17A099856
• A transform of the Jacobsthal numbers.at n=37A103312
• a(1) = 3, a(n+1) = 2*(3^n).at n=17A110593
• Number of nonzero palindromes of length n (in base 3).at n=34A117855
• Number of nonzero palindromes of length n (in base 3).at n=35A117855
• (0, 1, 2, 3, 2^2, 5, 2*3, 7, 2^3, 3^2, 2*5, 11, 2^2*3, 13,..) becomes (0^1*2, 3^2*2, 5^2*3, 7^2*3, 3^2*2, 5^11*2, 2^3*13,..).at n=33A143666
• Denominator of Euler(n,1/3).at n=17A156180