133893

Appears in sequences

• Number of 5-tuples of different integers from [ 2,n ] with no common factors among quadruples.at n=30A015645
• a(n) = 3*a(n-1) + 3*a(n-2), a(0)=0, a(1)=1.at n=10A030195
• Second binomial transform of binomial(n+3, 3).at n=8A081895
• Duplicate of A030195.at n=9A085481
• Numbers generated by recursive procedure a(n) = nozero(a(n-1) * 3), in which the function nozero(x) removes all zeros from x, starting with a(1) = 1.at n=29A243845
• Expansion of 1 / ( (1 - 8*x^4) * (1 - x/(1 - 8*x^4)^(1/4)) ).at n=22A373627