18100

Appears in sequences

• Coordination sequence for 4-dimensional I-centered tetragonal orthogonal lattice.at n=15A001386
• Number of paraffins (see Losanitsch reference for precise definition).at n=18A006010
• Row sums of A093919.at n=9A093920
• The common value of sigma_2 for square-amicable numbers, sigma_2(m)=sigma_2(n), m<n.at n=7A110929
• Number of nondecreasing arrangements of n numbers in -3..3 with sum zero and sum of squares not greater than n*12/3.at n=28A183921
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant = 1 (mod 3).at n=15A211034
• Number of binary arrays of length n+13 with no more than 7 ones in any length 14 subsequence (=50% duty cycle).at n=1A212401
• T(n,k)=Number of binary arrays of length n+2*k-1 with no more than k ones in any length 2k subsequence (=50% duty cycle).at n=29A212402
• Number of binary arrays of length 2*n+1 with no more than n ones in any length 2n subsequence (=50% duty cycle).at n=6A212403
• Numbers k that end with ( sum of digits of k )^2.at n=24A270343
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 323", based on the 5-celled von Neumann neighborhood.at n=29A271255
• a(n) = sigma_2(3*n).at n=37A283237
• Non-palindromic numbers n such that n * reverse(n) is a square and n and reverse(n) do not have the same number of digits.at n=29A322835
• The sum of the numbers of the central diamond of the multiplication table [1..k] X [1..k] for k=2*n-1.at n=9A357042
• a(n) = Sum_{d|n} d * (n/d)^d.at n=19A359103
• G.f. satisfies A(x) = 1 + x*A(x) + x^4*A(x)^3.at n=16A364552
• Number of binary words of length n not containing the substrings 0000, 0001, 0011, 0111.at n=21A368430