1730832

Appears in sequences

• Expansion of 1/(1 - 3*x*C(x)), where C(x) = (1 - sqrt(1 - 4*x))/(2*x) = g.f. for the Catalan numbers A000108.at n=10A007854
• Riordan array (1/(1-3x*c(x)),xc(x)), c(x) the g.f. of A000108.at n=55A117375