65580

Appears in sequences

• a(n) = Sum_{k=0..2n-3} T(n,k) * T(n,k+3), with T given by A027023.at n=4A027049
• a(n) = 2^(n+1) - 1 + 3*n.at n=15A131833
• Pentanacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5) if n>=5, and a(n) = n otherwise.at n=18A135056
• Coefficients of mock modular form H_1^(5) (divided by 2).at n=25A256054
• Number of key comparisons to sort all n! permutations of n elements by the optimal dual-pivot quicksort.at n=7A288965