102369domain: NAppears in sequencesa(n) = Sum_{k=0..2n-2} T(n,k) * T(n,k+2), with T given by A027023.at n=5A027048Numbers with exactly six distinct base-10 digits.at n=14A220076Semiprimes which have one or more occurrences of exactly six different digits.at n=2A235694