1899474678domain: NAppears in sequencesNumber of admissible sequences of order j; related to 3x+1 problem and Wagon's constant.at n=25A100982Length of Collatz dropping time patterns in A186008.at n=26A186009a(n) is the number of odd numbers k < 2^n such that A260590(k) = n.at n=41A260591