89799

Appears in sequences

• G.f. satisfies A(x) = 1 + x*A(x*A(x*A(x))).at n=10A087959
• Number of different strings of length n+4 obtained from "123...n" by iteratively duplicating any substring.at n=33A137741
• a(n) is the sum of all possible pairs of the first n primes.at n=35A162867
• Numbers that require exactly 8 iterations to determine that they are happy or not (A007770 and A031177).at n=13A193996
• Related to enumeration of sets of non-intersecting circles in the plane.at n=9A281345
• Number of nX7 0..1 arrays with every element equal to 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.at n=24A298186