756836domain: NAppears in sequencesa(1)=1, a(n) = n*5^(n-1) + a(n-1).at n=7A014917a(n) = 1 + 2*n + 3*n^2 + 4*n^3 + 5*n^4 + 6*n^5 + 7*n^6 + 8*n^7.at n=5A113618a(n) = A000043(n) - 3.at n=30A139480a(0)=0, a(1)=1, a(n) = min{5 a(k) + (5^(n-k)-1)/4, k=0..(n-1)} for n>=2.at n=36A259669