25163776domain: NAppears in sequencesSum of 2^n, ..., 2^(n+1) - 1.at n=12A010036Relates row sums of Pascal's triangle to expansion of cos(x)/exp(x).at n=24A100216Expansion of x*(1+5*x)/((1+2*x+1)*(1-4*x)).at n=13A117110Duplicate of A136488.at n=24A135098a(n) = 2^n - A005418(n).at n=24A136488