1806624domain: NAppears in sequencesNumber of strings of length n over Z_6 with trace 1 and subtrace 4.at n=9A073981Number of strings of length n over Z_6 with trace 3 and subtrace 4.at n=9A073993a(n) = n^4 * Sum_{d^2|n} 1 / d^4.at n=35A351602a(n) = n^4*sigma_4(n).at n=6A386784