420480

Appears in sequences

• a(n) = n! (1/C(n,0) + 1/C(n,1) + ... + 1/C(n,[ n/2 ])).at n=9A024419
• Minimal value of |product(A) - product(B)| where A and B are a partition of {1,2,3,...,n}.at n=19A038667
• Number of permutations (p_1, ..., p_n) of {1,...,n} that are "balanced" in the sense that the sum of k*p_k equals the sum of (n+1-k)*p_k; equivalently, the expected value of k*p_k is (expected value of k) times (expected value of p_k), assuming the uniform distribution.at n=11A056876
• Factorial splitting: write n! = x*y with x <= y and x maximal; sequence gives value of y-x.at n=18A061057
• Lower triangular array called S1hat(1) related to partition number array A107106.at n=56A144351
• a(n) = n!*Sum_{m=0..floor(n/2)} binomial(n,2*m)^(-1).at n=9A358791