30854domain: NAppears in sequencesT(n,k) = 1/k! * Sum_{i=0..k} (-1)^(k-i) *C(k,i) * A258306(n,i); triangle T(n,k), n>=0, 0<=k<=floor(n/2), read by rows.at n=31A258307Number of ways to tile vertically-fault-free 3 X n strip with squares and dominoes.at n=11A335747