42866domain: NAppears in sequencesa(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4.at n=44A025010Number of cycle types of direct products of two degree-n permutations.at n=17A053391Number of (w,x,y,z) with all terms in {0,...,n} and (least gapsize)>2.at n=17A212899