68136

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/26 ).at n=38A011936
• Let r, s, t be three permutations of the set {1,2,3,..,n}; a(n) = value of Sum_{i=1..n} r(i)*s(i)*t(i), with r={1,2,3,..,n}; s={n,n-1,..,1} and t={n,n-2,n-4,...,1,...,n-3,n-1}.at n=30A070893
• Sum of column entries of the table with rows of prime numbers (2,3,0,0,...), (0,5,7,11,0,...), (0,0,13,17,19,23,0,...), (0,0,0,29,31,37,41,43,0,...), ...at n=38A238760
• Number of length 6+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.at n=28A248439