7715736domain: NAppears in sequencesSum of all matrix elements of n X n matrix M(i,j) = i^3+j^3, (i,j = 1..n). a(n) = n^3*(n+1)^2/2.at n=26A099903a(n) is the number of n-digit positive integers with exactly four distinct base 10 digits.at n=7A337314