2798250domain: NAppears in sequencesNumber of primitive (aperiodic) word structures of length n using a 4-ary alphabet.at n=12A056275a(n) = (2^n + 4)*(2^n - 1)/6.at n=12A076024Number of set partitions of [n] into exactly four parts such that no part contains two elements with a circular distance less than three.at n=22A261480