94285792211domain: NAppears in sequencesNumber of sequences (a_1, a_2, ..., a_n) of length n with a_1 = 1 satisfying a_i <= a_{i+1} <= 2*a_i.at n=10A016121Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all but the outermost 5 rows or columns zero.at n=0A162031