774840978

Appears in sequences

• Pisot sequences E(2,6), L(2,6), P(2,6), T(2,6).at n=18A008776
• a(n) = 2*n^n, n >= 2, otherwise a(n) = 1.at n=9A013499
• a(0)=1; a(n) = 2*3^(n-1) for n >= 1.at n=19A025192
• 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=18A027334
• Dirichlet convolution of powers of 3 (3,9,27,...) with themselves.at n=16A034719
• Dirichlet convolution of 3^(n-1) with itself.at n=18A034751
• a(n) = Sum_{j=0..floor(n/3)} (-1)^j*binomial(n,3*j+1).at n=38A057682
• Expansion of (1+2*x+6*x^2)/(1-9*x^3).at n=28A076738
• 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=35A077626
• Sum of terms in periodic part of continued fraction expansion of square root of 1+3^n.at n=35A077630
• 9th binomial transform of (1,1,0,0,0,0,0,...).at n=9A081109
• a(n) = (5*3^n + (-3)^n)/6.at n=19A083423
• Expansion of (1+3*x)/(1-3*x).at n=18A099856
• a(1) = 3, a(n+1) = 2*(3^n).at n=18A110593
• Number of nonzero palindromes of length n (in base 3).at n=36A117855
• Records in A133048.at n=40A133059
• Denominator of Euler(n, 1/9).at n=9A156218
• a(n) = n^9 + 9^n.at n=9A185277
• Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.at n=16A206143
• Number of palindromes of length n in base 3 (A118594).at n=36A225367