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A046206
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In Leibniz's Harmonic Triangle, write denominator first and then numerator of each element.
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16
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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; internal format)
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OFFSET
| 1,3
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REFERENCES
| L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.
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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; ...
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CROSSREFS
| Cf. A003506.
Sequence in context: A138224 A181472 A046205 * A137753 A134780 A154819
Adjacent sequences: A046203 A046204 A046205 * A046207 A046208 A046209
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KEYWORD
| tabf,nonn,easy
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AUTHOR
| Mohammad K. Azarian (ma3(AT)evansville.edu)
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 13 1999
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