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 A046206 In Leibniz's Harmonic Triangle, write denominator first and then numerator of each element. 17
 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, 252 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 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. Sequence in context: A271825 A271875 A046205 * A137753 A134780 A247379 Adjacent sequences:  A046203 A046204 A046205 * A046207 A046208 A046209 KEYWORD tabf,nonn,easy AUTHOR EXTENSIONS More terms from James A. Sellers, Dec 13 1999 STATUS approved

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Last modified November 13 13:15 EST 2018. Contains 317149 sequences. (Running on oeis4.)