416416

Appears in sequences

• a(n) = (1/(1!*2!*3!*4!))*Sum_{1 <= x_1, x_2, x_3, x_4 <= n} |det V(x_1,x_2,x_3,x_4)|, where V(x_1,x_2,x_3,x_4) is the Vandermonde matrix of order 4.at n=12A133111
• Number of length 1+5 0..n arrays with every six consecutive terms having the maximum of some two terms equal to the minimum of the remaining four terms.at n=9A250082
• Maximum number of copies of a 123456 permutation pattern in an alternating (or zig-zag) permutation of length n + 9.at n=21A339356