3503640

Appears in sequences

• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.at n=8A208120
• a(n) = phi(n!-1), where phi is Euler's totient function (A000010).at n=8A366759