252416domain: NAppears in sequencesExpansion of x*(16*x^6+20*x^4-32*x^3+24*x^2-8*x+1) / ((-1+2*x)^2*(2*x^2-4*x+1)^2).at n=10A294452Number of 1's in truth table for Boolean function x1 x2 x4 + x2 x3 x5 + ... + x{n-3} x{n-2} xn + x{n-2} x{n-1} x1 + x{n-1} xn x2 + xn x1 x3.at n=15A305381a(n) = Sum_{k=1..n} floor(n/k)^4.at n=21A318743