29939

Appears in sequences

• a(n) = dot_product(1,2,...,n)*(7,8,...,n,1,2,3,4,5,6).at n=40A026049
• Let r, s, t be three permutations of the set {1,2,3,..,n}; a(n) = value of Sum_{i=1..n} r(i)*s(i)*t(i), with r={1,2,3,..,n}; s={n,n-1,..,1} and t={n,n-2,n-4,...,1,...,n-3,n-1}.at n=24A070893
• Coefficients in a q-analog of the function LambertW(-2*x)/(-2*x), as a triangle read by rows.at n=38A152555
• G.f.: exp( Sum_{n>=1} sigma(3n)*x^n/n ).at n=12A182819
• Equals one maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..3 nX5 array.at n=2A221061
• T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..3 nXk array.at n=23A221062
• Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..3 3Xn array.at n=4A221064
• T(n,k)=Equals one maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..2 nXk array.at n=23A221660
• Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..2 3Xn array.at n=4A221661
• Number of obtuse triangles, distinct up to congruence, on a centered hexagonal grid of size n.at n=14A241234
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 129", based on the 5-celled von Neumann neighborhood.at n=37A270219
• Numbers k such that 371*2^k+1 is prime.at n=26A323010
• Number of compositions (ordered partitions) of n into at most 6 squarefree parts.at n=30A347783
• a(n) = Sum_{k=0..n} binomial(4*n+4*k,n-k).at n=5A390410