18142

Appears in sequences

• a(n) = A026626(2*n, n).at n=8A026627
• a(n) = A026626(n, floor(n/2)).at n=16A026632
• Sum{T(i,n-i): i=0,1,...,n}, array T as in A047089.at n=15A047090
• Table T(n,k) counts the involutions of n with longest increasing contiguous subsequence of length k.at n=57A178249
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2<x^2+y^2.at n=29A211635
• Numbers for which the cube of the sum of the digits is equal to the square of the product of their digits.at n=23A241846
• Expansion of 1/(1 - Sum_{j>=1} x^(Sum_{i=1..j} prime(i))).at n=45A282906
• a(n) is the permanent of the n X n matrix M(n) that is defined by M[i,j] = ceiling(i*j/3).at n=5A358161
• a(n) is the sum of distinct sums of all subsets with two or more elements of {1, 2, ..., n}.at n=19A375764
• a(n) is the number of ways to partition an n X n X n cube into 4 noncongruent cuboids.at n=26A384311