23907

Appears in sequences

• Number of bicentered trees with n nodes.at n=17A000677
• Sum of n-th antidiagonal of array in A081998.at n=21A082001
• Number of compositions of n such that the largest part is coprime to every other part.at n=17A130709
• a(n) = Sum_{i+j+k=n, i,j,k >= 1} tau(i)*tau(j)*tau(k), where tau() = A000005().at n=37A191829
• Number of (w,x,y,z) with all terms in {1,...,n} and w >= harmonic mean of {x,y,z}.at n=14A212107
• Number of 5 X n arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..1 5 X n array.at n=26A220035
• Number of (n+1) X 8 0..2 matrices with each 2 X 2 subblock idempotent.at n=12A224675
• Sum of the largest parts in the partitions of 3n into 3 parts.at n=25A236370
• Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=5A258521
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=30A258522
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=33A258522