143664

Appears in sequences

• A Chebyshev transform of 3^n.at n=12A090413
• Expansion of 1/(1+8*x*c(x)), c(x) the g.f. of Catalan numbers A000108.at n=6A126985
• a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(i*j*k) / phi(j*k).at n=23A372663