192640

Appears in sequences

• Number of subsets of integers 1 through n (including the empty set) containing no pair of integers that share a common factor.at n=38A084422
• a(0) = 1, a(n) = 20*sigma[3](n).at n=21A091983
• Number of nX4 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal.at n=2A207204
• T(n,k)=Number of nXk 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal.at n=17A207208
• Number of 3Xn 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal.at n=3A207209