521984domain: NAppears in sequences11th column of A172119.at n=19A172320Number of binary words of length n which have no 0^b 1 1 0^a 1 0 1 0^b - matches, where a=b=2.at n=19A234592a(n) is the sum of the first 2*n nonzero n-bonacci numbers.at n=10A364145