63813

Appears in sequences

• Riordan array (1/(1-x*c(3*x)), x*c(3*x)/(1-x*c(3*x))), c(x) the g.f. of A000108.at n=30A110519
• Expansion of ( 5-9*x^2-2*x^3 ) / ( (1+x-x^2)*(1-x-x^2-x^3) ).at n=18A190914
• Number of non-abelian groups of order prime(n)^6.at n=33A271811
• a(n) = Sum_{k=1..n} sigma(n*k).at n=38A372710