263480domain: NAppears in sequencesa(0)=0; for n>0, a(n) = Sum_{d|n} d*2^(n/d).at n=18A054598Number of permutations of 0..(n-1) representable as consecutive sums of 5 adjacent elements of a sequence of n+4 nonnegative integers.at n=13A180208Expansion of (1+x)^3/(1-x-2*x^2-x^3+x^4).at n=16A300438