68719738880domain: NAppears in sequencesNumber of types of Boolean functions of n variables under a certain group.at n=17A028402a(-1) = 1; for n >= 0, a(n) = 2^n + 4^n = 2^n*(1 + 2^n).at n=19A063376a(n) = 2^n + 4^n.at n=18A161168