60040

Appears in sequences

• Numerator of n*(n-2)*(2*n-1)/(2*(n-1)).at n=38A022997
• Molecular topological indices of the crown graphs.at n=19A192796
• Number of n X 3 0..1 arrays with rows unimodal and antidiagonals nondecreasing.at n=7A224404
• T(n,k)=Number of nXk 0..1 arrays with rows unimodal and antidiagonals nondecreasing.at n=52A224409
• Let s denote the sum of the abundant numbers in the aliquot parts of x. Sequence lists numbers x such that sigma(s) = usigma(x), where usigma(x) is the sum of the unitary divisors of x (A034448).at n=16A258135
• a(n) = n*(n + 1)*(5*n^2 + 5*n - 4)/12.at n=19A264853