6757062domain: NAppears in sequencesa(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1 and a(2) = a(3) = 3.at n=22A049972Expansion of (7-41*x+42*x^2)/((1-6*x)*(1-3*x)*(1-2*x)).at n=8A147546