61711domain: NAppears in sequencesNumber of strict integer partitions of 2*n with no subset summing to n.at n=46A321142Numbers that cannot be expressed as sum of at most nine repdigits numbers. One may not add two integers with the same repeated digit.at n=18A339673a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j*k).at n=26A372633