71272domain: NAppears in sequencesColumn 10 of array illustrated in A089574 and related to A034261.at n=5A108538Number of length n binary sequences with at most 3 of every 6 adjacent bits set.at n=19A133551G.f. satisfies: A(x) = Sum_{n>=0} x^(n(n+1)/2) * A(x)^n.at n=17A157133