56832

Appears in sequences

• Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n containing k DHH...HU's, where U=(1,1), D=(1,-1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).at n=45A098083
• Values of n such that (sigma(sigma(n))-phi(phi(n)))/n is an integer (the corresponding integral ratios are given in A136132).at n=27A136131
• Numbers which can be expressed as the product of numbers made of only eights.at n=14A161146
• E.g.f. A(x) satisfies: A( x - Sum_{n>=2} x^n/(n*(n-1)/2) ) = x.at n=5A209937
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 291", based on the 5-celled von Neumann neighborhood.at n=18A287502
• Heinz numbers of integer partitions whose product of parts is one greater than their sum.at n=20A325041
• Number of integer partitions lambda (of any k) satisfying n = max_{p:lambda} p*m(p,lambda), where m(p,lambda) is the multiplicity of part p in lambda.at n=10A332233
• Number T(n,k) of ways to place k nonattacking queens on an n X n board; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=64A348129
• a(n) is the number of positive integer solutions of n*x*y*z*v*w = (x + n) * (y + n) * (z + n) * (v + n) * (w + n), x <= y <= z <= v <= w.at n=16A381644
• Numbers k such that k + A224787(k) is a square.at n=25A386640