185517

Appears in sequences

• Sum(C(j)*(n-j)*4^(n-j-1),j=0..n-1), C = Catalan numbers.at n=8A018218
• A triangle related to A000108 (Catalan) and A000302 (powers of 4).at n=47A046527
• Riordan array (1/((1-4*x)*c(x)),x*c(x)/sqrt(1-4*x)), c(x) the g.f. of A000108.at n=47A113955
• Number of ordered triples (w,x,y) with all terms in {-n,...-1,1,...,n} and w+2x+2y>0.at n=36A211624
• a(n) = 2^(2*n - HammingWeight(n)) * [x^n] ((x - 1)^(-2) - (1 - x)^(-3/2)).at n=8A380952