30496

Appears in sequences

• Quadruples of different integers from [ 2,n ] with no common factors between triples.at n=34A015629
• T(2n+1,n+3), T given by A026780.at n=6A026900
• Number of partitions of n that do not contain 9 as a part.at n=40A027343
• Numbers k for which phi(k) = phi(k+1) - phi(k-1).at n=24A076529
• Expansion of (1-x)/(1+2*x+2*x^2-2*x^3).at n=16A078067
• Number of (n+1)X(5+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=10A237634