168399

Appears in sequences

• Odd numbers divisible by exactly 9 primes (counted with multiplicity).at n=16A046322
• Triangle T(n,k) of number of minimal 4-covers of a labeled n-set that cover k points of that set uniquely (k=4,..,n).at n=19A057965
• Numbers k such that k * (digit complement of k) is a square.at n=10A069000
• Numerator of Product_{2 <= p < 2*n} (2*n - p)/p.at n=19A084762
• Number of ternary rooted identity (distinct subtrees) trees with n nodes.at n=18A116379
• Numbers n such that the sum of the digits of the numbers from 1 to n divides the sum of the numbers from 1 to n.at n=28A272360
• a(n) = 2*12^n*Gamma(n+1/2)*(n+1)/(sqrt(Pi)*Gamma(n+3)).at n=6A275607
• Numerator of (3/4)^n * binomial(2*n,n).at n=6A285008
• a(n) = (1/3!)*3^(n+1)*(n+5)*(n+1)*(n).at n=5A288836
• Triangle (sans apex) of coefficients of terms of the form (eM_1)^j*(eM_2)^k re construction of triangle A287768.at n=38A288842
• Numerators of rational valued sequence whose Dirichlet convolution with itself yields A234840, which is a multiplicative permutation of natural numbers.at n=63A317930
• Numerators of rational valued sequence whose Dirichlet convolution with itself yields A003961.at n=63A318321
• The number of conics tangent to five non-singular curves of degree n in general position, in a projective plane defined over an algebraically closed field of characteristic zero.at n=2A328148
• Triangle read by rows: T(n,w) is the number of n-step self avoiding walks on a 3D cubic lattice confined inside a tube of cross section 2w X 2w where the walk starts at the center of the tube's side.at n=31A337401
• Triangle read by rows: T(n,w) is the number of n-step self avoiding walks on a 3D cubic lattice confined between two infinite horizontal planes a distance 2w apart and an orthogonal plane on the y-z axes, where the walk starts at the middle point between the planes on the y-z plane.at n=31A338127