1,2
C. Kimberling, Problem 10520 in Amer. Math. Mon. 103 (1996) p. 347.
Sequence in context: A184653 A206334 A184741 * A175312 A057640 A037030
Adjacent sequences: A020956 A020957 A020958 * A020960 A020961 A020962
nonn
Clark Kimberling (ck6(AT)evansville.edu)