137781

Appears in sequences

• Largest order of automorphism group of a tournament with n nodes.at n=23A000198
• Largest order of automorphism group of a tournament with n nodes.at n=24A000198
• Numbers that are the sum of 7 positive 9th powers.at n=35A003396
• a(n) = 7*3^n.at n=9A005032
• Expansion of a modular function for gamma_0(6).at n=29A006708
• Expansion of 1/((1-3x)(1-6x)(1-9x)(1-12x)).at n=4A028085
• Numbers k that divide the (right) concatenation of all numbers <= k written in base 9 (most significant digit on left).at n=33A029454
• Numbers whose prime factors are 3 and 7.at n=24A033850
• Triangular matrix arising in enumeration of catafusenes, read by rows.at n=63A038763
• Odd numbers divisible by exactly 10 primes (counted with multiplicity).at n=2A046323
• McKay-Thompson series of class 18B for the Monster group.at n=28A058532
• Smallest k > n such that there are exactly n pairs (x,y) (1 <= x <= y <= k) solutions of the equation: phi(xy)=sigma(x)+sigma(y).at n=36A071780
• Coefficient of the highest power of q in the expansion of nu(0)=1, nu(1)=b and for n >= 2, nu(n) = b*nu(n-1) + lambda*(n-1)_q*nu(n-2) with (b,lambda)=(2,3), where (n)_q = (1+q+...+q^(n-1)) and q is a root of unity.at n=20A072985
• Stirling2 triangle with scaled diagonals (powers of 3).at n=31A075498
• Triangle of generalized Chebyshev coefficients.at n=46A080419
• a(n) = (n+1)*(n+6)*3^n/6.at n=8A080420
• 3rd binomial transform of (1,2,0,0,0,0,0,0,...).at n=9A081038
• a(n) = (7*3^n - 4*0^n)/3.at n=10A082541
• Duplicate of A082541.at n=10A083596
• Expansion of (1-3*x+12*x^2)/((1-3*x)*(1+3*x)).at n=10A091103