214841domain: NAppears in sequencesa(n) = 1 + n*(n+1)*(n^2-n+12)/12.at n=40A136396Number of strings of numbers x(i=1..7) in 0..n with sum i^2*x(i) equal to n*49.at n=14A183958Expansion of Product_{k>=1} (1 + k*x^k)^sigma(k), where sigma = A000203.at n=13A318484