6973568802

Appears in sequences

• Pisot sequences E(2,6), L(2,6), P(2,6), T(2,6).at n=20A008776
• a(0)=1; a(n) = 2*3^(n-1) for n >= 1.at n=21A025192
• 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=20A027334
• Dirichlet convolution of powers of 3 (3,9,27,...) with themselves.at n=18A034719
• a(n) = n*3^n.at n=18A036290
• n*bigomega(n)^n, where bigomega(n) is the number of prime divisors of n, counted with multiplicity.at n=17A061452
• Expansion of (1+2*x+6*x^2)/(1-9*x^3).at n=31A076738
• a(n) = 3^n(n^2 - n + 18)/18.at n=18A081909
• a(n) = (5*3^n + (-3)^n)/6.at n=21A083423
• Expansion of (1+3*x)/(1-3*x).at n=20A099856
• a(1) = 3, a(n+1) = 2*(3^n).at n=20A110593
• Denominators of a ternary BBP-type formula for log(3).at n=17A154920
• 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=18A206143
• a(n) = phi(n^7).at n=26A239442
• Expansion of g.f. (1-7*x)/(1-9*x).at n=11A270369
• Sum of the degrees of asymmetry of all ternary words of length n.at n=19A274499
• a(n) = f_n(2), with f_0(x) = x+2, f_n+1(x) = (f_n)^x(x).at n=3A274992
• a(n) = 2*n^(2*n^2 + 2).at n=3A275002
• Numbers m > 2 such that every divisor > 2 is the sum of two or more consecutive divisors.at n=30A290582