630373domain: NAppears in sequencesNumber of doublerises in all bargraphs having semiperimeter n (n>=2). A doublerise in a bargraph is any pair of adjacent up steps.at n=12A273714a(n) is the smallest position in the subtract-a-factorial game for which the value of the Sprague-Grundy function (or nim-value) is n.at n=9A355556