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 A046205 In Leibniz's Harmonic Triangle, write numerator first and then denominator of each element. 16
 1, 1, 1, 2, 1, 2, 1, 3, 1, 6, 1, 3, 1, 4, 1, 12, 1, 12, 1, 4, 1, 5, 1, 20, 1, 30, 1, 20, 1, 5, 1, 6, 1, 30, 1, 60, 1, 60, 1, 30, 1, 6, 1, 7, 1, 42, 1, 105, 1, 140, 1, 105, 1, 42, 1, 7, 1, 8, 1, 56, 1, 168, 1, 280, 1, 280, 1, 168, 1, 56, 1, 8, 1, 9, 1, 72, 1, 252, 1, 504, 1, 630, 1, 504, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 REFERENCES L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25. LINKS EXAMPLE 1/1; 1/2, 1/2; 1/3, 1/6, 1/3; 1/4, 1/12, 1/12, 1/4; 1/5, 1/20, 1/30, 1/20, 1/5; ... CROSSREFS Cf. A003506, A046206, A046212, A046201, A046204, A046208, A007622, A137752, A137753, A137754. Sequence in context: A181472 A271825 A271875 * A046206 A137753 A134780 Adjacent sequences:  A046202 A046203 A046204 * A046206 A046207 A046208 KEYWORD tabf,nonn,easy,less AUTHOR EXTENSIONS More terms from Gregory D Johnson (gjohn(AT)iname.com) Edited by M. F. Hasler, Apr 05 2015 STATUS approved

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Last modified November 12 21:10 EST 2018. Contains 317116 sequences. (Running on oeis4.)