46851domain: NAppears in sequencesa(n) is least k such that k and 2k are anagrams in base n (written in base 10).at n=19A023094Fifth diagonal (m=4) of triangle A084938; a(n) = A084938(n+4,n) = (n^4 + 18*n^3 + 131*n^2 + 426*n)/24.at n=28A090386Expansion of (-1 + Product_{k>=1} 1 / (1 + (-x)^k))^3.at n=43A341241